Venous System and Blood Flow Quiz

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Which factor would lead to an increase in blood pressure and decrease in blood flow?

Increased cardiac output

Decreased vessel length

Increased artery compliance

Increased blood viscosity (correct)

What is the impact of hypovolemia on blood pressure?

Increase in blood flow

Increase in blood pressure

Decrease in blood pressure (correct)

No effect on blood pressure

If a person gains weight, how might it affect their blood pressure?

Increase in compliance of arteries (correct)

Decrease in blood viscosity

Decrease in cardiac output

Increase in vessel radius

What effect does a narrow and shorter vessel have on blood flow?

Increases resistance and decreases flow Signup and view all the answers

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

Carry blood away from the heart Signup and view all the answers

How does an increase in cardiac output affect blood pressure?

Increases blood flow and pressure Signup and view all the answers

What is the primary difference between muscular arteries and elastic arteries?

Muscular arteries have more muscle fiber and less elastic fiber Signup and view all the answers

How does the diameter of arterioles compare to that of muscular arteries?

Arterioles have a smaller diameter than muscular arteries Signup and view all the answers

Which type of capillary is characterized by having pores that make it permeable to larger molecules?

Fenestrated capillary Signup and view all the answers

What is the function of precapillary sphincters in regulating blood flow?

To control blood flow into capillary beds Signup and view all the answers

Why is it important that not all precapillary sphincters are open simultaneously?

To avoid excessive blood accumulation in capillary beds Signup and view all the answers

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

It allows the structure to have flexibility Signup and view all the answers

Why do arteries have thicker walls than veins?

To maintain blood pressure Signup and view all the answers

Which tunic of blood vessels is mainly composed of collagenous fibers and some smooth muscle?

Tunica Externa Signup and view all the answers

What is the role of vasa vasorum in blood vessels?

They deliver nutrients and remove waste from the cells of large vessels Signup and view all the answers

What happens during vasoconstriction in blood vessels?

Blood flow decreases and blood pressure increases Signup and view all the answers

What is the primary function of the valves in veins?

To prevent blood from flowing backward Signup and view all the answers

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

Facilitate diapedesis Signup and view all the answers

Which of the following best describes veins in comparison to arteries?

Considered blood reservoirs Signup and view all the answers

What is the formula for Mean Arterial Pressure (MAP) calculation?

(Systolic BP + Diastolic BP) / 3 Signup and view all the answers

What is the main purpose of valves in veins?

Prevent backflow due to low pressure Signup and view all the answers

What does a high pulse pressure indicate?

Possible cardiovascular issues Signup and view all the answers

In case MAP falls below 60 mm Hg for an extended period, what health issues may arise?

Ischemia and hypoxia Signup and view all the answers