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Mammalian Circulation and Cardiovascular System

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Mammalian Circulation and Cardiovascular System

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Questions and Answers

What happens to oxygen in the capillaries?

It is produced by cellular respiration

It diffuses from the blood to the tissues (correct)

It is transported back to the heart

It is stored in the abdominal organs

Where do the two venae cavae empty their blood?

Into the right ventricle

Into the left atrium

Into the pulmonary artery

Into the right atrium (correct)

What is the primary function of the atria?

To regulate heart rate

To pump blood throughout the body

To collect blood returning to the heart (correct)

To produce oxygen

What is the term for the contraction phase of the cardiac cycle?

Systole Signup and view all the answers

What determines cardiac output?

Heart rate and stroke volume Signup and view all the answers

What is the average stroke volume in humans?

70 mL Signup and view all the answers

What is the purpose of the valves in the heart?

To prevent backflow and keep blood moving in the correct direction Signup and view all the answers

What is the sound pattern produced by the closing of the two sets of heart valves?

Lub-dup, lub-dup Signup and view all the answers

Where is the human heart located?

Behind the sternum Signup and view all the answers

During heavy exercise, what happens to cardiac output?

It increases up to fivefold Signup and view all the answers

What happens to the blood as it flows through the capillary beds in the left and right lungs?

It loads O2 and unloads CO2 Signup and view all the answers

What is the main function of the coronary arteries?

To supply blood to the heart muscle itself Signup and view all the answers

What is the route of oxygen-rich blood from the lungs to the body tissues?

Pulmonary veins → Left atrium → Left ventricle → Aorta → Body tissues Signup and view all the answers

What is the purpose of the pulmonary circuit?

To load oxygen and unload carbon dioxide in the lungs Signup and view all the answers

What is the role of the left ventricle in the mammalian cardiovascular system?

To pump oxygen-rich blood to the body tissues Signup and view all the answers

Why is it crucial to maintain a continuous supply of oxygen to the body’s organs?

To prevent brain cell death Signup and view all the answers