after nervous stimulation stops, what prevents ach in the synaptic cleft from continuing to stimulate contraction?
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After nervous stimulation stops, ACh in the synaptic cleft is prevented from continuing stimulation of contraction by: A) calcium ions returning to the terminal cisternae B) the tropomyosin blocking the myosin once full contraction is achieved C) acetylch
Answer to: After nervous stimulation stops, ACh in the synaptic cleft is prevented from continuing stimulation of contraction by: A) calcium ions...
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After nervous stimulation stops, ACh in the synaptic cleft is prevented from continuing...
After nervous stimulation stops, ACh in the synaptic cleft is prevented from continuing... Question:
After nervous stimulation stops, ACh in the synaptic cleft is prevented from continuing stimulation of contraction by:
A) calcium ions returning to the terminal cisternae
B) the tropomyosin blocking the myosin once full contraction is achieved
C) acetylcholinesterase destroying the ACh
D) the action potential stopped going down the overloaded T tubules
Neural transmission:
When a neural impulse reaches the synaptic end bulb of the neuron, a neurotransmitter is released into the synaptic cleft. The neurotransmitter is a chemical messenger which binds to receptors in the plasma membrane of the cell which the neuron is communicating. Binding of the neurotransmitter with the receptor will result in a change occurring with the cell.
Answer and Explanation:
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After nervous stimulation stops, ACh in the synaptic cleft is prevented from continuing stimulation of contraction by:
A) calcium ions returning to...
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Neurotransmitters are chemicals that trigger reactions between neurons to pass messages, a necessity to neurological activity. Explore the two functions of reuptake and degradation to learn how they apply to neurotransmitters and neurons.
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after nervous stimulation stops what prevents ach
Muscle Fibers Relax When the Nervous System Signal Is No Longer Present. When the stimulation of the motor neuron providing the impulse to the muscle fibers
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Contents
1 What prevents the ACh from continuing to stimulate the muscle?
2 What happens to the muscle when nerve stimulation stops?
3 What is the first thing that stops a contraction after the nerve stops sending ACh?
4 When a muscle is unable to respond to stimuli temporarily it is in which of the following?
5 What prevents acetylcholine from accumulating in the neuromuscular junction?
6 What breaks down ACh into its building blocks rendering it inactive?
7 What happens when the motor neuron stops releasing ACh?
8 How does ACh cause muscle contraction?
9 What is the fate of acetylcholine ACh after it binds to ACh receptors?
10 How is ACh removed from the synaptic cleft?
11 Where does the end plate potential occur?
12 When a muscle fiber contracts the I band diminishes in size the H zone disappears and the A bands do not diminish in length?
13 During which period of a twitch is a muscle unable to respond to another stimulus?
14 When the muscle tension developed overcomes the load and muscle shortening occurs?
15 What is the functional role of the T tubules quizlet?
16 Is curare a neurotransmitter?
17 What happens if acetylcholine is inhibited?
18 Why does acetylcholine need to be broken down?
19 Which enzyme degrades the acetylcholine once it is released from the receptors?
20 What happens to acetylcholine after its function is complete?
21 What happens to the ACh during repolarization?
22 What happens to acetylcholine ACh after it is released from the presynaptic membrane?
23 How does ACh inhibit cardiac muscle?
24 What happens when acetylcholine is removed from muscle cells?
25 What effect does acetylcholine have on ileum?
26 Which of the following inhibits the release of acetylcholine into the neuromuscular junction?
27 When acetylcholine binds its receptor at the motor end plate?
28 What is the fate of acetylcholine?
29 What would happen if acetylcholine was not removed from the synaptic cleft?
30 How is ACh cleared from the synaptic cleft quizlet?
31 How is acetylcholine ACh removed from the synaptic cleft quizlet?
32 What causes an end plate potential?
33 What is end plate neuromuscular junction?
34 What is the function of the motor end plate?
35 Neuromuscular Junction, Animation
36 Myasthenia Gravis
37 S4 Biology Olecture 8 Worksheet of chapter 12 solution
38 BTL Presentation Core to Floor
What prevents the ACh from continuing to stimulate the muscle?
Cards
Term What is the role of calcium ions in muscle contraction? Definition Bind to regulatory sites on troponin to remove contraction inhibition.
Term After nervous stimulation stops, what prevents ACh in the synaptic cleft from continuing to stimulate contraction? Definition acetylcholinesterase destroying the ACh
What happens to the muscle when nerve stimulation stops?
Muscle Fibers Relax When the Nervous System Signal Is No Longer Present. When the stimulation of the motor neuron providing the impulse to the muscle fibers stops, the chemical reaction that causes the rearrangement of the muscle fibers’ proteins is stopped.
What is the first thing that stops a contraction after the nerve stops sending ACh?
The first thing that stops a contraction after the nerve stops sending ACh is: Acetylcholinesterase destroys the ACh, and they are removed from the membrane receptors. The functional role of the T tubules is to: Enhance cellular communication during muscle contraction.
When a muscle is unable to respond to stimuli temporarily it is in which of the following?
The correct answer: When a muscle is unable to respond to stimuli temporarily, it is during B) refractory period.
What prevents acetylcholine from accumulating in the neuromuscular junction?
What prevents acetylcholine (ACh) from accumulating in the neuromuscular junction and causing a sustained contraction in a normal individual? Succinylcholine acts as a depolarizing agent that prevents repolarization of the nerve. Therefore, no further ACh is released until the drug is cleared.
What breaks down ACh into its building blocks rendering it inactive?
Transcribed image text: Acetylcholifne A neurotransmitter released at motor end plates by the axon terminals Acetylcholinesterase 4. Breaks down ACh into its building blocks, rendering it inactive.
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What happens when the motor neuron stops releasing ACh?
What happens when the motor neuron stops releasing ACh? … Enzyme acetylcholinesterase will break down ACh, and end-plate potentials in muscle fiber would not be generated. This would eventually bring an end to contraction mechanism.
How does ACh cause muscle contraction?
Skeletal muscle contraction and changes with exercise. (A) Neurotransmitter (acetylcholine, ACh) released from nerve endings binds to receptors (AChRs) on the muscle surface. The ensuing depolarization causes sodium channels to open, which elicits an action potential that propagates along the cell.
Ch. 9 A&P (KASP) Flashcards
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Ch. 9 A&P (KASP)
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1) The muscle cell membrane is called the ________.
A) endomysium B) perimysium
C) sarcolemma D) epimysium
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C
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2) After nervous stimulation stops, what prevents ACh in the synaptic cleft from continuing to stimulate contraction?
A) the tropomyosin blocking the myosin once full contraction is achieved
B) calcium ions returning to the terminal cisternae
C) acetylcholinesterase destroying the ACh
D) the action potential stops going down the overloaded T tubules
Click card to see definition 👆
C
Click again to see term 👆
1/76 Created by karen_medina2
Terms in this set (76)
1) The muscle cell membrane is called the ________.
A) endomysium B) perimysium
C) sarcolemma D) epimysium
C
2) After nervous stimulation stops, what prevents ACh in the synaptic cleft from continuing to stimulate contraction?
A) the tropomyosin blocking the myosin once full contraction is achieved
B) calcium ions returning to the terminal cisternae
C) acetylcholinesterase destroying the ACh
D) the action potential stops going down the overloaded T tubules
C
3) Muscle tone is ________.
A) a state of sustained partial contraction
B) the condition of athletes after intensive training
C) the feeling of well-being following exercise
D) the ability of a muscle to efficiently cause skeletal movements
A
4) Which muscle cells have the greatest ability to regenerate?
A) skeletal
B) no muscle can regenerate
C) cardiac D) smooth D
5) What part of the sarcolemma contains acetylcholine receptors?
A) any part of the sarcolemma
B) end of the muscle fiber
C) part adjacent to another muscle cell
D) motor end plate D
6) Which of the following is the correct sequence of events for muscle contractions?
A) motor neuron action potential, neurotransmitter release, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke, sliding of myofilaments
B) muscle cell action potential, neurotransmitter release, ATP-driven power stroke, calcium ion release from SR, sliding of myofilaments
C) neurotransmitter release, motor neuron action potential, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke
D) neurotransmitter release, muscle cell action potential, motor neuron action potential, release of calcium ions from SR, sliding of myofilaments, ATP-driven power stroke
A
7) When a muscle is unable to respond to stimuli temporarily, it is in which of the following periods?
A) relaxation period
B) fatigue period C) latent period
D) refractory period
D
8) The mechanism of contraction in smooth muscle is different from skeletal muscle in that ________.
A) the site of calcium regulation differs
B) ATP energizes the sliding process
C) actin and myosin interact by the sliding filament mechanism
D) the trigger for contraction is a rise in intracellular calcium
A
9) Which of the following statements is true?
A) Striated muscle cells are long and cylindrical with many nuclei.
B) Cardiac muscle cells have many nuclei.
C) Smooth muscle cells have T tubules.
D) Cardiac muscle cells are found in the heart and large blood vessels.
A
10) What is the functional role of the T tubules?
A) synthesize ATP to provide energy for muscle contraction
B) stabilize the G and F actin
C) enhance cellular communication during muscle contraction
D) hold cross bridges in place in a resting muscle
C
11) During muscle contraction, myosin cross bridges attach to which active sites?
A) actin filaments B) Z discs C) myosin filaments D) thick filaments A
12) The major function of the sarcoplasmic reticulum in muscle contraction is to ________.
A) regulate intracellular calcium concentration
B) synthesize actin and myosin myofilaments
C) provide a source of myosin for the contraction process
D) make and store phosphocreatine
A
13) Which of the following statements is false or incorrect?
A) Under normal resting conditions, cardiac muscle tissue contracts and relaxes about 75 times per minute.
B) Cardiac muscle fibers can use lactic acid to make ATP.
C) Cardiac muscle fibers depend mostly on anaerobic cellular respiration to generate ATP.
D) Cardiac muscle contracts when stimulated by its own auto-rhythmic muscle cells.
C
14) What is the role of tropomyosin in skeletal muscles?
A) Tropomyosin is the receptor for the motor neuron neurotransmitter.
B) Tropomyosin serves as a contraction inhibitor by blocking the actin binding sites on the myosin molecules.
C) Tropomyosin is the name of a contracting unit.
D) Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.
D
15) Smooth muscles that act like skeletal muscles but are controlled by autonomic nerves and hormones are ________.
A) multiunit muscles
B) white muscles
C) single-unit muscles
D) red muscles A
16) What structure in skeletal muscle cells functions in calcium storage?
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