Venous System: Venules and Veins

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Questions and Answers

How does an increase in cardiac output affect blood pressure and blood flow?

Increase blood pressure but decrease blood flow
Decrease both blood pressure and blood flow
Decrease blood pressure but increase blood flow
Increase both blood pressure and blood flow (correct)

What is the impact of decreased compliance of arteries on blood pressure and blood flow?

Increase blood pressure and increase blood flow (correct)
Decrease blood pressure and decrease blood flow
Increase blood pressure and decrease blood flow
Decrease blood pressure and increase blood flow

How does the viscosity of blood affect blood pressure?

Reduce blood flow
No effect on pressure
Increase pressure (correct)
Decrease pressure

What happens to blood flow if a vessel becomes narrower and longer?

Decrease flow and increase pressure (B) Signup and view all the answers

How does a decrease in blood volume (hypovolemia) affect blood pressure?

Decrease blood pressure (A) Signup and view all the answers

What is the main function of arteries in the cardiovascular system?

To help maintain blood pressure (D) Signup and view all the answers

Which layer of the blood vessel is primarily composed of smooth muscle supported by connective tissue?

Tunica Media (D) Signup and view all the answers

What is the role of vasa vasorum in the cardiovascular system?

Delivering nutrients and removing waste from large vessels (D) Signup and view all the answers

Which statement best describes vasoconstriction in blood vessels?

Decreases blood flow and increases blood pressure (A) Signup and view all the answers

What is the function of the external elastic membrane in larger arteries?

Supports the structure with flexibility (A) Signup and view all the answers

Which type of blood vessel has valves to prevent backward flow of blood?

Veins (C) Signup and view all the answers

What is the primary function of venules in the circulatory system?

Return blood back toward the heart (A) Signup and view all the answers

Which structure in the venous system helps prevent backflow of blood?

Veins (A) Signup and view all the answers

What is the main function of systolic blood pressure?

It measures the pressure during ventricular contraction (D) Signup and view all the answers

What is diastolic blood pressure a measure of?

The pressure during ventricular relaxation (D) Signup and view all the answers

What is the purpose of pulse pressure in the cardiovascular system?

To indicate the difference between systolic and diastolic blood pressure (B) Signup and view all the answers

If mean arterial pressure (MAP) falls below 60 mm Hg for a prolonged period, what is a potential concern?

Risk of ischemia and hypoxia (D) Signup and view all the answers

What is the function of arterioles in the cardiovascular system?

To lead blood from arteries to capillaries (D) Signup and view all the answers

Why are capillaries considered microscopic vessels?

Due to their thin walls (D) Signup and view all the answers

What is the main characteristic of continuous capillaries?

Complete endothelial lining with tight junctions (B) Signup and view all the answers

How do arterioles contribute to maintaining blood pressure?

By being muscular and slightly contracted (B) Signup and view all the answers

What is the role of metarterioles in the cardiovascular system?

To control blood flow into a capillary bed (B) Signup and view all the answers

Why do precapillary sphincters remain closed until needed?

To ensure proper oxygen distribution and waste removal (D) Signup and view all the answers

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