Circulatory System Quiz

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Which layer of the heart is responsible for the rhythmic contraction for pumping?

Endocardium
Epicardium
Myocardium (correct)
Subendocardium

What are the components of the circulatory system?

Heart, arteries, veins, capillaries, lymphatics (correct)
Endocardium, subendocardium, purkinje fibers, muscle fibers
Atria, ventricles, myocardium, epicardium
Endothelium, mesothelium, connective tissue, serous fluid

Which layer of the heart is the thickest?

Epicardium
Subendocardium
Endocardium
Myocardium (correct)

What is the function of the epicardium?

Prevention of friction as the heart beats (A) Signup and view all the answers

Where are the Purkinje fibers located?

Endocardium (D) Signup and view all the answers

Which layer of the heart is the innermost layer?

Endocardium (B) Signup and view all the answers

Which layer of the heart is fibroelastic connective tissue with scattered smooth muscle?

Endocardium (D) Signup and view all the answers

Which layer of the heart is continuous with tissue of the myocardium?

Endocardium (B) Signup and view all the answers

Which layer of the heart is responsible for producing serous fluid?

Epicardium (D) Signup and view all the answers

Which layer of the heart is the outermost layer?

Epicardium (A) Signup and view all the answers

Which type of vessel carries blood back to the heart?

Veins (C) Signup and view all the answers

Which layer of a large vein tends to be thicker than the tunica media?

Tunica adventitia (D) Signup and view all the answers

What is the role of valves in large veins?

To prevent backflow of blood (B) Signup and view all the answers

Which type of vessel collects interstitial fluid and returns it to the blood?

Lymphatic vessels (C) Signup and view all the answers

What is the main function of elastic arteries?

To conduct blood from the heart and help move blood forward under steady pressure (A) Signup and view all the answers

Which type of vessel has the thickest tunica adventitia?

Veins (A) Signup and view all the answers

What is the major determinant of systemic blood pressure in capillaries?

Elastic recoil (A) Signup and view all the answers

Which type of vessel has the thinnest walls?

Capillaries (C) Signup and view all the answers

What is the main function of muscular arteries?

To resist and control blood flow to capillaries (C) Signup and view all the answers

Which type of vessel has the most distinct layers of smooth muscle?

Arteries (D) Signup and view all the answers

Which layer of the pericardium is the outer layer, fibrous sac with serous lining?

Parietal layer (A) Signup and view all the answers

What is the function of the cardiac skeleton?

All of the above (D) Signup and view all the answers

What is the function of the heart valves?

Prevent backflow of blood (B) Signup and view all the answers

What is the function of the endothelium in blood vessels?

Monitors molecule exchange (A) Signup and view all the answers

What is the function of the vaso vasorum in blood vessels?

Brings oxygen and nutrients to cells too far from the lumen (D) Signup and view all the answers

What is the main function of large/elastic arteries?

Regulate blood pressure (D) Signup and view all the answers

What is the main function of medium/muscular arteries?

Distribute blood to organs (C) Signup and view all the answers

What is the main function of small arteries/arterioles?

Regulate blood pressure (B) Signup and view all the answers

What is the main function of capillaries?

Exchange between blood and interstitial fluid (A) Signup and view all the answers

What is the function of venules?

Carry deoxygenated blood (C) Signup and view all the answers