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The Circulatory System and the Heart

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Questions and Answers

What is the name of the membrane that lines the four chambers of the heart?

Epicardium

Pericardium

Myocardium

Endocardium (correct)

Which type of blood vessel has walls with a thick layer of smooth muscle that contracts with the rhythm of the heart?

Capillaries

Venules

Veins

Arteries (correct)

What is the main function of capillary vessels in the circulatory system?

Transport blood away from the heart

Ensure blood pressure stays constant

Contract with the rhythm of the heart

Connect the arterial side to the venule side (correct)

Which type of blood vessel transports oxygen-poor blood towards the lungs?

Arteries Signup and view all the answers

During which phase of the cardiac cycle does the heart contract and pump blood into the arteries?

Systole phase Signup and view all the answers

What color is the blood usually found in veins, closer to the surface of the body?

Dark red and carbon dioxide-rich Signup and view all the answers

What is the main function of the circulatory system?

Transporting blood with oxygen from the lungs to cells Signup and view all the answers

Which blood vessels are part of the circulatory system?

Arteries, veins, and capillaries Signup and view all the answers

What is the function of the pericardium around the heart?

Prevents friction during heart contractions Signup and view all the answers

How many chambers does each half of the heart have?

One atrium and two ventricles Signup and view all the answers

What is the role of the heart in the circulatory system?

Pumps and circulates blood through rhythmic contractions Signup and view all the answers

Where is the heart situated in the human body?

Behind the sternum (breast bone) Signup and view all the answers