the left ventricular wall of the heart is thicker than the right wall in order to ________.
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The left ventricular wall of the heart is thicker than the right wall in order to ________. A accommodate a greater volume of blood B expand the thoracic cage during diastole C pump blood with greater pressure D pump blood through a smaller valve
The left ventricular wall of the heart is thicker than the right wall in order to ________. A accommodate a greater volume of blood B expand the thoracic cage during diastole C pump blood with greater pressure D pump blood through a smaller valve
Question
The left ventricular wall of the heart is thicker than the right wall in order to ________.
A
accommodate a greater volume of blood
B
expand the thoracic cage during diastole
C
pump blood with greater pressure
D
pump blood through a smaller valve
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Explain why in the heart the wall of the left ventricle is thicker than the wall of the right ventricle?
This is because the left ventricle pumps oxygenated blood round the entire body while the right ventricle only pumps blood to the lungs which is a much shorter di...
Answers>Human Biology>GCSE>Article
Explain why in the heart the wall of the left ventricle is thicker than the wall of the right ventricle?
This is because the left ventricle pumps oxygenated blood round the entire body while the right ventricle only pumps blood to the lungs which is a much shorter distance. Because the left ventricle needs to pump the blood further it needs to generate more force during contraction in order to do this. This extra force is generated due to the additional muscle found in the left ventricle wall compared to the right ventricle wall. Additionally, the blood being pumped to the lungs from the right ventricle needs to be at a lower pressure in order to prevent damage to the many thin capilaries the blood goes through in the lungs. This helps to explain why the wall of the right ventricle is thinner.
Answered by Katie D. • Human Biology tutor64566 Views
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Chapter 18: The Heart Flashcards
Start studying Chapter 18: The Heart. Learn vocabulary, terms, and more with flashcards, games, and other study tools.
Chapter 18: The Heart
The heart is actually (one, two, or three) pumps?
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two pumps
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Which chamber receives blood from the superior and inferior vena cavae?
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right atrium
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Terms in this set (99)
The heart is actually (one, two, or three) pumps?
two pumps
Which chamber receives blood from the superior and inferior vena cavae?
right atrium
Which heart chamber receives blood from the pulmonary veins?
left atrium
Which heart chamber pumps unoxygenated blood out the pulmonary trunk?
right ventricle
Which chamber pumps oxygenated blood out the aorta to the systemic circuit?
left ventricle
The layers of the heart wall from superficial to deep are:
epicardium, myocardium, and endocardium.
The heart has _____ chambers and _____ valves.
4; 4
Which of the following does not deliver blood to the right atrium?
Inferior vena cava Superior vena cava Coronary sinus Pulmonary veins Pulmonary veins
The role of the coronary arteries is to:
supply blood to the heart tissue
Which of the following is not a difference between the left and right ventricles?
The walls of the left ventricle are thicker than the walls of the right ventricle.
The left ventricle pumps blood to the systemic circuit, while the right ventricle pumps blood to the pulmonary circuit.
The left ventricle receives a smaller percentage of coronary blood supply than the right ventricle.
The left ventricle is a more powerful pump than the right ventricle.
The left ventricle receives a smaller percentage of coronary blood supply than the right ventricle.
The ________ valve is located between the right atrium and the right ventricle.
tricuspid
Which of the following is not a difference between cardiac and skeletal muscle?
The plasma membranes of cardiac muscle cells interlock, but skeletal muscle fibers are independent.
Cardiac muscle does not use the sliding filament mechanism for contraction; skeletal muscle does.
Cardiac muscle cells quickly die in the absence of oxygen; skeletal muscle cells are better able to adapt to oxygen deficiency.
Cardiac muscle cells contain more mitochondria than do skeletal muscle cells.
Cardiac muscle does not use the sliding filament mechanism for contraction; skeletal muscle does
Which heart chamber sends deoxygenated blood to the lungs?
right ventricle
Which valve is located between the right atrium and ventricle?
tricuspid valve
What structures connect the individual heart muscle cells?
intercalated discs
Which of the following terms refers to a lack of oxygen supply to heart muscle cells?
ischemia infarction
functional syncytium
embolism ischemia
Which of the events below does not occur when the semilunar valves are open?
AV valves are closed.
Ventricles are in systole.
Blood enters pulmonary arteries and the aorta.
Ventricles are in diastole.
Ventricles are in diastole.
The left ventricular wall of the heart is thicker than the right wall in order to ________.
pump blood with greater pressure
Blood within the pulmonary veins returns to the ________.
left atrium
Small muscle masses attached to the chordae tendineae are the ________.
papillary muscles
The term for pain associated with deficient blood delivery to the heart that may be caused by the transient spasm of coronary arteries is ________.
angina pectoris
The source of blood carried to capillaries in the myocardium would be the ________.
coronary arteries
The fact that the left ventricle of the heart is thicker than the right ventricle reveals that it ________.
pumps blood against a greater resistance
When viewing a dissected heart, it is easy to visually discern the right and left ventricles by ________.
noticing the thickness of the ventricle walls
Select the correct statement about the heart valves.
The mitral valve separates the right atrium from the right ventricle.
Aortic and pulmonary valves control the flow of blood into the heart.
The tricuspid valve divides the left atrium from the left ventricle.
The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur.
The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur
Select the correct statement about the structure of the heart wall.
Connective tissue in the heart wall aids in the conduction of the action potential.
The heart chambers are lined by the endomysium.
The myocardium is the layer of the heart that actually contracts.
The fibrous skeleton forms the bulk of the heart.
The myocardium is the layer of the heart that actually contracts.
The enlarged coronary vessel outside the heart that empties blood into the right atrium is the ________.
coronary sinus
The ________ valve of the heart has three flaps with chordae tendineae.
tricuspid
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