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    which structure of the heart acts like an automatic door that closes once blood enters a chamber and forces it to exit in the proper direction?

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    Heartbeat

    The heart has four chambers and four main blood vessels that either bring blood to the heart, or carry blood away.

    Heartbeat

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    Overview

    The heart has four chambers and four main blood vessels that either bring blood to the heart, or carry blood away.

    The four chambers are the right atrium and right ventricle and the left atrium and left ventricle. The blood vessels include the superior and inferior vena cava. These bring blood from the body to the right atrium. Next is the pulmonary artery that carries blood from the right ventricle to the lungs. The aorta is the body's largest artery. It carries oxygen-rich blood from the left ventricle to the rest of the body.

    Beneath the tough fibrous coating of the heart, you can see it beating.

    Inside the chambers are a series of one-way valves. These keep the blood flowing in one direction.

    Dye injected into the superior vena cava, will pass through all the heart's chambers during one cardiac cycle.

    Blood first enters the heart's right atrium. A muscle contraction forces the blood through the tricuspid valve into the right ventricle.

    When the right ventricle contracts, blood is forced through the pulmonary semilunar valve into the pulmonary artery. Then it travels to the lungs.

    In the lungs, the blood receives oxygen then leaves through the pulmonary veins. It returns to the heart and enters the left atrium.

    From there, blood is forced through the mitral valve into the left ventricle. This is the muscular pump that sends blood out to the rest of the body.

    When the left ventricle contracts, it forces blood through the aortic semilunar valve and into the aorta.

    The aorta and its branches carries the blood to all the body's tissues.

    Review Date 7/7/2020

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    Source : medlineplus.gov

    Science Unit 8.4 Flashcards

    Flashcard Machine - ― ― ― Home Flashcards Science Science Unit 8.4

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    Science Unit 8.4

    The Circulatory System

    8 Science 5th Grade 09/21/2009

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    Additional Science Flashcards

    Additional Science Flashcards Cards

    Term

    TRUE or FALSE: All organisms have a closed circulatory system.

    Definition

    FALSEWhich structure of the heart acts like an automatic door that

    Term

    closes once blood enters a chamber and forces it to exit in the

    proper direction. Definition

    Valves

    Term

    Which part of the heart takes blood from the veins and pumps it

    into a ventricle? Definition

    AtriaWhat is the name of one of the lower chambers of the heart

    Term

    that receives blood from the upper chambers and pumps it into the

    arteries? Definition

    Ventricles

    Term

    What is the name of the blood vessels that carry blood from the

    heart to all the other parts of the body?

    Definition

    Arteries

    Term

    The circulatory system transports oxygen and nutrients to cells of the

    body. What does it remove from the body?

    Definition

    Carbon dioxide and other wastes

    Term

    Explain how blood flows through the human heart. Be sure to include the

    words lung, valve, atrium, and blood in your answer.

    Definition

    The heart has 4 chambers that blood collects. The upper chambers are called the atria while the lower chambers are called the ventricles. At the opening of each chamber is a valve

    Term

    valves make sure that once blood enters the chamber it flows in the correct direction. Blood enters the heart through the right atrium. It flows

    into the right ventricle and is pumped into the lungs.

    Blood full

    Definition

    of oxygen from the lungs enters the left atrium. It flows into the

    left ventricle and is pumped into the body’s arteries to be carried

    to the body’s cells.

    Source : www.flashcardmachine.com

    How the Heart Works

    Find out more about how the heart works. Learn to identify the different parts of the heart and watch our video about how a healthy heart functions.

    How the heart works

    The human heart pumps blood to every part of your body. Learn about the different parts of the heart and watch our video about how a healthy heart works.

    Your heart is the pump which powers your body. It supplies blood carrying oxygen and nutrients to every cell, nerve, muscle and vital organ in your body.

    It sits in your chest between your lungs, slightly to the left of centre, and is protected by your rib cage.

    Your heart is about the size of your clenched fist and weighs about 300 grams (that's just over half a packet of butter).

    Watch our step-by-step video of how the heart works

    What are the parts of the heart?

    Your heart is a bit like a house. It has:

    outer walls (the outer muscle or myocardium)

    rooms (chambers) doors (valves)

    plumbing (arteries and veins)

    electrics (the electrical conduction system).

    Heart walls

    The walls of your heart are made of powerful muscle tissue, which squeezes and relaxes to pump blood around your body. This muscle tissue is divided into three layers.

    The endocardium (the inside layer).

    The myocardium (the muscular middle layer).

    The epicardium (the protective outer layer).

    Heart chambers (rooms)

    Your heart is made up of four chambers, two on the right and two on the left. These are like the rooms of your house.

    The top two chambers are called the left and right atrium and the bottom two are called the left and right ventricles.

    They are divided by a thin wall called the septum.

    Heart valves (the doors between the rooms)

    There are four heart valves, which act like doors between the chambers of the heart. They open and close as your heart pumps.

    The valves only open one way. This stops blood flowing in the wrong direction between the chambers of your heart.

    The two valves that sit between the upper and lower chambers of the heart are called the atrioventricular, or AV valves.

    The tricuspid valve is the door between the right atrium and ventricle.

    The mitral valve is the door between the left atrium and ventricle.

    The other two valves are the doors out of the ventricles. They are called semilunar, or SL valves.

    The aortic valve is the door out of the left ventricle into the aorta.

    The pulmonary valve is the door out of the right ventrical into the pulmonary artery.

    The blood vessels (the plumbing)

    Blood travels between the heart and the lungs and the rest of the body, via a network of pipes called the blood vessels. There are three main types of blood vessels.

    Arteries, which carry oxygenated blood from your heart to the rest of your body.

    Veins, which carry the de-oxygenated blood back to your heart and lungs.

    Capillaries, the small vessels where oxygenated and de-oxygenated blood is exchanged.

    How the heart pumps

    Your conduction system sends the electrical signals which trigger the heart to pump blood around the body, and to and from the lungs.

    Blood which has used all its oxygen is returned to the right side of the heart, via large veins called the inferior and superior vena cava. From there it is pumped to the lungs, via the pulmonary artery.

    Once the blood has received oxygen from the lungs, it travels through the pulmonary veins into the left side of the heart. From here it is pumped back out around the body, via the aorta.

    The heart's conduction system (the electrics)

    Your heart has its own electrical wiring system (conduction system), which keeps it beating. This conduction system includes:

    the sinoatrial (SA) node (or sinus node). This is your body’s own internal pacemaker, that produces electrical signals to make your heart beat

    the atrioventricular (AV) node. This is a node that passes on the electrical signals from the upper chambers of the heart (artia) to the lower ones (ventricles)

    the bundle of His, the left and right bundle branches, and the Purkinje fibres. These act like electrical wiring that communicate the signals around the heart.

    The SA node sends an electrical signal that makes the upper chambers of the heart (atria) contract (squeeze). This pushes blood out of the atria and into the lower chambers of the heart (ventricles).

    The electrical signal passes from the atria to the AV node. From there, it passes through the bundle of His and into the right and left bundle branches.

    Finally, the signal travels down the Purkinje fibres, causing the ventricles to contract. This pushes blood out of your heart to your lungs and the rest of your body.

    Source : www.heartfoundation.org.nz

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