if you want to remove an article from website contact us from top.

    action potential propagation in a skeletal muscle fiber ceases when acetylcholine is removed from the synaptic cleft. which of the following mechanisms ensures a rapid and efficient removal of acetylcholine?

    James

    Guys, does anyone know the answer?

    get action potential propagation in a skeletal muscle fiber ceases when acetylcholine is removed from the synaptic cleft. which of the following mechanisms ensures a rapid and efficient removal of acetylcholine? from EN Bilgi.

    MAP #7 Flashcards

    Study Flashcards On MAP #7 at Cram.com. Quickly memorize the terms, phrases and much more. Cram.com makes it easy to get the grade you want!

    Flashcards » MAP #7

    Map #7

    by shinglypanda, Apr. 2012

    Subjects: 219 7 bio map physiology

    Favorite Add to folder Flag Flashcards Tweet

    Related Essays

    Calcium Signaling

    The major sensors are the EF-hand proteins troponin C and calmodulin. Calmodulin is found intracellularly and has two globular domains each containing a pair...

    The Mammalian Nervous System: Neurons

    D. Neurotransmitters release from the vesicles and discharge into the synaptic cleft. E. Neurotransmitters diffuse across the synaptic cleft and bind to the ...

    Module 3: Normal Anatomy And Physiology Of Muscle Contraction

    The calcium ions move to the middle of the sarcomere. The sarcomere is the microscopic area in the middle of the muscle fiber, which is made of actin and myo...

    And Catalytic Mechanisms: Carbohydrate Metabolism, Adenosine Triphosphate

    • Elevated lactate leads to tissue hypoxia, hypoperfusion, and possible damage. (Wikipedia, 2013) CITRIC ACID CYCLE • 3 types of molecules can feed into ...

    Glutamate Degradation

    After astrocytes remove glutamate from the ECS, glutamate must be isolated and degraded. Glutamate transporters are bidirectional, so intracellular elevation...

    Photosynthesis Process

    This then is split evenly (a phosphate and 3 carbon each) into triose phosphates. After oxidation occurs, hydrogen is removed and is used in order for NAD to...

    Muscle Cells Lab Report

    Once the bridges are formed, the myosin pulls on the actin contracting the muscle. Cross bridge formation can only occur, however, when the binding sites on ...

    The Pain Receptors Are Called Nociceptors

    16. How the chemicals which released during tissue damage sensitized nociceptors? (1pt) Act to either decrease the threshold of nociceptors or to directly ac...

    The Importance Of Resting Membrane Potential

    Voltage gated calcium channels in the sarcolemma are opened by the end plate threshold and then rush into the axon terminal. The calcium released from the te...

    Skeletal Muscle Research Paper

    The actin and myosin in the sarcomere use what is known as the sliding filament theory as means of causing the contractions of muscle. Myosin slides along ac...

    CARD RANGE TO STUDY

    through

    Use LEFT and RIGHT arrow keys to navigate between flashcards;Use UP and DOWN arrow keys to flip the card;H to show hint;A reads text to speech;

    Share Print Export Clone

    57 Cards in this Set

    Action potential propagation in a skeletal muscle fiber ceases when acetylcholine is removed from the synaptic cleft. Which of the following mechanisms ensures a rapid and efficient removal of acetylcholine?

    a. Acetylcholine is transported back into the axon terminal by a reuptake mechanism.

    b. Acetylcholine is transported into the postsynaptic neuron by receptor-mediated endocytosis.

    c. Acetylcholine diffuses away from the cleft.

    d. Acetylcholine is degraded by acetylcholinesterase.

    d. Acetylcholine is degraded by acetylcholinesterase.

    The neuromuscular junction is a well-studied example of a chemical synapse. Which of the following statements describes a critical event that occurs at the neuromuscular junction?

    a. Acetylcholine is released and moves across the synaptic cleft bound to a transport protein.

    b. When the action potential reaches the end of the axon terminal, voltage-gated sodium channels open and sodium ions diffuse into the terminal.

    c. Acetylcholine binds to its receptor in the junctional folds of the sarcolemma. Its receptor is linked to a G protein.

    d. Acetylcholine is released by axon terminals of the motor neuron.

    d. Acetylcholine is released by axon terminals of the motor neuron.

    Action potentials travel the length of the axons of motor neurons to the axon terminals. These motor neurons __________.

    extend from the brain or spinal cord to the sarcolemma of a skeletal muscle fiber

    Calcium entry into the axon terminal triggers what events?

    Synaptic vesicles fuse to the plasma membrane of the axon terminal and release acetylcholine.

    Acetylcholine binds to its receptor in the sarcolemma and triggers __________.

    the opening of ligand-gated cation channels

    Sodium and potassium ions do not diffuse in equal numbers through ligand-gated cation channels. Why?

    The inside surface of the sarcolemma is negatively charged compared to the outside surface. Sodium ions diffuse inward along favorable chemical and electrical gradients.

    Excitation-contraction coupling is a series of events that occur after the events of the neuromuscular junction have transpired. The term excitation refers to which step in the process?

    Excitation, in this case, refers to the propagation of action potentials along the sarcolemma.

    Excitation of the sarcolemma is coupled or linked to the contraction of a skeletal muscle fiber. What specific event initiates the contraction?

    Calcium release from the sarcoplasmic reticulum initiates the contraction.

    A triad is composed of a T-tubule and two adjacent terminal cisternae of the sarcoplasmic reticulum. How are these components connected?

    A series of proteins that control calcium release.

    What is name given to the regularly spaced infoldings of the sarcolemma?

    Source : www.cram.com

    Ch 12 Flashcards

    Study Ch 12 flashcards. Create flashcards for FREE and quiz yourself with an interactive flipper.

    Skip to main content

    Ch 12

    30cards Biology

    Human Anatomy & Physiology

    Action potential propagation in a skeletal muscle fiber ceases when acetylcholine is removed from the synaptic cleft. Which of the following mechanisms ensures a rapid and efficient removal of acetylcholine?

    Acetylcholine is degraded by acetylcholinesterase.

    Acetylcholinesterase is an enzyme that degrades acetylcholine. This degradation results in a rapid cessation of the acetylcholine signal and a swift removal from the cleft.

    The neuromuscular junction is a well-studied example of a chemical synapse. Which of the following statements describes a critical event that occurs at the neuromuscular junction?

    A. Acetylcholine binds to its receptor in the junctional folds of the sarcolemma. Its receptor is linked to a G protein. B. Acetylcholine is released and moves across the synaptic cleft bound to a transport protein. C. Acetylcholine is released by axon terminals of the motor neuron. D. When the action potential reaches the end of the axon terminal, voltage-gated sodium channels open and sodium ions diffuse into the terminal.

    C. Acetylcholine is released by axon terminals of the motor neuron.

    Action potentials travel the length of the axons of motor neurons to the axon terminals. These motor neurons __________.

    Extend from the brain or spinal cord to the sarcolemma of a skeletal muscle fiber

    Calcium entry into the axon terminal triggers which of the following events?

    Synaptic vesicles fuse to the plasma membrane of the axon terminal and release acetylcholine.

    Acetylcholine binds to its receptor in the sarcolemma and triggers __________.

    the opening of ligand-gated cation channels

    Sodium and potassium ions do not diffuse in equal numbers through ligand-gated cation channels. Why?

    A. The inside surface of the sarcolemma is negatively charged compared to the outside surface. Sodium ions diffuse inward along favorable chemical and electrical gradients. B. The inside surface of the sarcolemma is negatively charged compared to the outside surface. Potassium ions diffuse inward along favorable chemical and electrical gradients. C. The outside surface of the sarcolemma is negatively charged compared to the inside surface. Sodium ions diffuse outward along favorable chemical and electrical gradients. D. The outside surface of the sarcolemma is negatively charged compared to the inside surface. Potassium ions diffuse outward along favorable chemical and electrical gradients.

    A. The inside surface of the sarcolemma is negatively charged compared to the outside surface. Sodium ions diffuse inward along favorable chemical and electrical gradients.

    Excitation-contraction coupling is a series of events that occur after the events of the neuromuscular junction have transpired. The term excitation refers to which step in the process?

    Excitation, in this case, refers to the propagation of action potentials along the sarcolemma. (this will lead to contraction).

    Excitation of the sarcolemma is coupled or linked to the contraction of a skeletal muscle fiber. What specific event initiates the contraction?

    Calcium release from the sarcoplasmic reticulum initiates the contraction

    A triad is composed of a T-tubule and two adjacent terminal cisternae of the sarcoplasmic reticulum How are these components connected?

    a series of proteins that control calcuim release

    What is the name given to the regularly spaced infoldings of the sarcolemma?

    transverse or T tubules

    Which of the following is most directly responsible for the coupling of excitation to contraction of skeletal muscle fibers?

    Calcium ions

    What is the relationship between the number of motor neurons recruited and the number of skeletal muscle fibers innervated?

    Typically, hundreds of skeletal muscle fibers are innervated by a single motor neuron.

    __________ is the neurotransmitter used to carry a message from a motor neuron to a skeletal muscle fiber.

    Acetylcholine

    Binding of a neurotransmitter onto the motor end plate of a skeletal muscle fiber results in the opening of __________ channels, causing a depolarization.

    Sodium

    An action potential spreading from the motor end plate on a skeletal muscle fiber causes opening of calcium channels in the __________.

    sarcoplasmic reticulum

    When calcium is released into the cytoplasm of a skeletal muscle fiber, it binds to __________.

    troponin

    The repeated binding and unbinding of myosin to actin is called __________ cycling.

    crossbridge

    The cross bridge cycle is a series of molecular events that occur after excitation of the sarcolemma. What is a cross bridge?

    A myosin head bound to actin

    As soon as the activated myosin head forms a cross bridge with actin, the power stroke begins.

    What structure is the functional unit of contraction in a skeletal muscle fiber?

    The sarcomere

    Calcium ions couple excitation of a skeletal muscle fiber to contraction of the fiber. Where are calcium ions stored within the fiber?

    Calcium ions are stored in the sarcoplasmic reticulum.

    After a power stroke, the myosin head must detach from actin before another power stroke can occur. What causes cross bridge detachment?

    ATP binds to the myosin head.

    The binding of ATP to the myosin head weakens the bond between myosin and actin, forcing the myosin head to detach. ATP also provides the energy for the next power stroke.

    Source : www.chegg.com

    MasteringA&P 07 Muscles Flashcards

    A&P Flix: Events at the Neuromuscular Junction A&P Flix: Excitation-Contraction Coupling A&P Flix: The Cross Bridge Cycle\ IP: Cardiac Cycle

    MasteringA&P 07 Muscles

    5.0 26 Reviews

    Action potential propagation in a skeletal muscle fiber ceases when acetylcholine is removed from the synaptic cleft. Which of the following mechanisms ensures a rapid and efficient removal of acetylcholine?

    Click card to see definition 👆

    Acetylcholine is degraded by acetylcholinesterase.This degradation results in a rapid cessation of the acetylcholine signal and a swift removal from the cleft.

    Click again to see term 👆

    The neuromuscular junction is a well-studied example of a chemical synapse. Which of the following statements describes a critical event that occurs at the neuromuscular junction?

    Click card to see definition 👆

    Acetylcholine is released by axon terminals of the motor neuron.

    Click again to see term 👆

    1/36 Created by Selz94

    A&P Flix: Events at the Neuromuscular Junction

    A&P Flix: Excitation-Contraction Coupling

    A&P Flix: The Cross Bridge Cycle\

    IP: Cardiac Cycle

    Terms in this set (36)

    Action potential propagation in a skeletal muscle fiber ceases when acetylcholine is removed from the synaptic cleft. Which of the following mechanisms ensures a rapid and efficient removal of acetylcholine?

    Acetylcholine is degraded by acetylcholinesterase.This degradation results in a rapid cessation of the acetylcholine signal and a swift removal from the cleft.

    The neuromuscular junction is a well-studied example of a chemical synapse. Which of the following statements describes a critical event that occurs at the neuromuscular junction?

    Acetylcholine is released by axon terminals of the motor neuron.

    Action potentials travel the length of the axons of motor neurons to the axon terminals. These motor neurons __________.

    extend from the brain or spinal cord to the sarcolemma of a skeletal muscle fiber

    Calcium entry into the axon terminal triggers which of the following events?

    Synaptic vesicles fuse to the plasma membrane of the axon terminal and release acetylcholine.

    Acetylcholine binds to its receptor in the sarcolemma and triggers __________.

    the opening of ligand-gated cation channels

    Sodium and potassium ions do not diffuse in equal numbers through ligand-gated cation channels. Why?

    The inside surface of the sarcolemma is negatively charged compared to the outside surface. Sodium ions diffuse inward along favorable chemical and electrical gradients.

    Excitation-contraction coupling is a series of events that occur after the events of the neuromuscular junction have transpired. The term excitation refers to which step in the process?

    Excitation, in this case, refers to the propagation of action potentials along the sarcolemma.

    Excitation of the sarcolemma is coupled or linked to the contraction of a skeletal muscle fiber. What specific event initiates the contraction?

    Calcium release from the sarcoplasmic reticulum initiates the contraction.

    A triad is composed of a T-tubule and two adjacent terminal cisternae of the sarcoplasmic reticulum. How are these components connected?

    A series of proteins that control calcium release.

    What is name given to the regularly spaced infoldings of the sarcolemma?

    transverse or T tubules

    Which of the following is most directly responsible for the coupling of excitation to contraction of skeletal muscle fibers?

    Calcium ions.

    What is the relationship between the number of motor neurons recruited and the number of skeletal muscle fibers innervated?

    Typically, hundreds of skeletal muscle fibers are innervated by a single motor neuron.

    The cross bridge cycle is a series of molecular events that occur after excitation of the sarcolemma. What is a cross bridge?

    A myosin head bound to actin

    What structure is the functional unit of contraction in a skeletal muscle fiber?

    The sarcomere

    Calcium ions couple excitation of a skeletal muscle fiber to contraction of the fiber. Where are calcium ions stored within the fiber?

    Calcium ions are stored in the sarcoplasmic reticulum.

    After a power stroke, the myosin head must detach from actin before another power stroke can occur. What causes cross bridge detachment?

    ATP binds to the myosin head.

    How does the myosin head obtain the energy required for activation?

    The energy comes from the hydrolysis of ATP.

    What specific event triggers the uncovering of the myosin binding site on actin?

    Calcium ions bind to troponin and change its shape.

    When does cross bridge cycling end?

    Cross bridge cycling ends when sufficient calcium has been actively transported back into the sarcoplasmic reticulum to allow calcium to unbind from troponin.

    Slow oxidative muscle fibers are best suited for:

    endurance activities.

    The calcium calmodulin system of contraction regulation is found in:

    smooth muscle only.

    z disc, H zone, I band, M line etc

    ...

    Which of the following is a factor that affects the velocity and duration of muscle contraction?

    load on the fiber

    Immediately following the arrival of the stimulus at a skeletal muscle cell there is a short period called the ________ period during which the events of excitation-contraction coupling occur.

    latent

    Cardiac muscle makes most of its ATP via anaerobic mechanisms.

    Source : quizlet.com

    Do you want to see answer or more ?
    James 11 month ago
    4

    Guys, does anyone know the answer?

    Click For Answer