16 Questions
What happens to oxygen in the capillaries?
It diffuses from the blood to the tissues
Where do the two venae cavae empty their blood?
Into the right atrium
What is the primary function of the atria?
To collect blood returning to the heart
What is the term for the contraction phase of the cardiac cycle?
Systole
What determines cardiac output?
Heart rate and stroke volume
What is the average stroke volume in humans?
70 mL
What is the purpose of the valves in the heart?
To prevent backflow and keep blood moving in the correct direction
What is the sound pattern produced by the closing of the two sets of heart valves?
Lub-dup, lub-dup
Where is the human heart located?
Behind the sternum
During heavy exercise, what happens to cardiac output?
It increases up to fivefold
What happens to the blood as it flows through the capillary beds in the left and right lungs?
It loads O2 and unloads CO2
What is the main function of the coronary arteries?
To supply blood to the heart muscle itself
What is the route of oxygen-rich blood from the lungs to the body tissues?
Pulmonary veins → Left atrium → Left ventricle → Aorta → Body tissues
What is the purpose of the pulmonary circuit?
To load oxygen and unload carbon dioxide in the lungs
What is the role of the left ventricle in the mammalian cardiovascular system?
To pump oxygen-rich blood to the body tissues
Why is it crucial to maintain a continuous supply of oxygen to the body’s organs?
To prevent brain cell death
Learn about the mammalian cardiovascular system and how it meets the body's continuous demand for oxygen. Discover how the heart and circulatory system work together to deliver oxygen to organs and tissues.
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