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16 Questions

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Human Circulatory System Overview

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Questions and Answers

Which blood vessels have thicker walls due to higher pressure from pumped blood?

Arterioles and veins

Arteries and arterioles (correct)

Capillaries

Venules and veins

What is the function of valves in veins?

To control contraction and dilation

To increase the diameter of the veins

To maintain high pressure in veins

To stop backflow due to low pressure (correct)

Which layer of blood vessels contains muscles for vasoconstriction and vasodilation?

Tunica intima

Internal elastic membrane

Tunica externa

Tunica media (correct)

What is the function of vasa vasorum in blood vessels?

To supply nutrients to large blood vessels Signup and view all the answers

Which blood vessels have larger lumens?

Venules and veins Signup and view all the answers

What is the function of nervi vasorum in blood vessels?

To control contraction and dilation Signup and view all the answers

Which type of capillary is the most common?

Continuous capillary Signup and view all the answers

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

To regulate blood flow and blood pressure Signup and view all the answers

What is the primary factor that slows down blood flow through the body?

Resistance Signup and view all the answers

What is Mean Arterial Pressure (MAP) calculated as?

$\text{Diastolic BP} + \text{Pulse Pressure}/3$ Signup and view all the answers

Which statement about veins is true?

Veins have valves to prevent backflow Signup and view all the answers

What does Hypovolemia refer to?

Low blood volume Signup and view all the answers

Which component of blood has a gradual impact on increasing blood pressure over time?

Blood viscosity Signup and view all the answers

What is the primary function of precapillary sphincters?

Control blood flow into capillaries Signup and view all the answers

'Ischemia' is a condition primarily caused by:

Hypoxia Signup and view all the answers

'Pulse pressure' is defined as the difference between:

$\text{Systolic BP}$ and $\text{Diastolic BP}$ Signup and view all the answers