Human Circulatory System Overview

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Why do arteries and arterioles have thicker walls?

To allow for better oxygen exchange

To facilitate the flow of deoxygenated blood

To accommodate larger lumens

Due to higher pressure from pumped blood (correct)

What is the function of venules in the circulatory system?

To carry oxygenated blood to the heart

To supply nutrients to large blood vessels

To prevent backflow due to low pressure

To connect capillaries to veins (correct)

What is the role of vasa vasorum in blood vessels?

Prevent backflow in veins

Control contraction and dilation

Supply nutrients to large blood vessels (correct)

Line the endothelium in arteries

Which layer of a blood vessel contains muscles for vasoconstriction and vasodilation?

Tunica media Signup and view all the answers

What is the function of the external elastic membrane in blood vessels?

Provides structure while allowing stretch Signup and view all the answers

Where are nervi vasorum found and what is their function?

Close to lumen in arteries, controlling contraction and dilation Signup and view all the answers

Which type of capillary is the least common?

Sinusoid capillary Signup and view all the answers

What is the name for the combination of an arteriole and a capillary?

Metarteriole Signup and view all the answers

What is the average pressure in arteries known as?

Mean Arterial Pressure (MAP) Signup and view all the answers

What is the purpose of precapillary sphincters in the circulatory system?

To regulate blood flow into capillaries Signup and view all the answers

What does a high pulse pressure indicate?

High resistance in vessels Signup and view all the answers

What is the function of venules in the circulatory system?

Form veins by coming together Signup and view all the answers

Which factor determines compliance in the circulatory system?

"Metal vs. Balloon" analogy Signup and view all the answers

'Ischemia' refers to:

Insufficient blood flow accompanied by hypoxia Signup and view all the answers

'Hypovolemia' is associated with:

Low blood volume Signup and view all the answers

'Pulse' is primarily related to:

"Expansion and contraction of arteries due to blood flow" Signup and view all the answers

What is the main factor that affects blood pressure according to the text?

Vessel diameter Signup and view all the answers

Where does filtration occur in a capillary?

At the arteriole end Signup and view all the answers

Which hormone is released if blood volume drops, signaling the kidneys to reabsorb water to maintain fluid volume and blood pressure?

Renin Signup and view all the answers

What is the function of angiotensin-converting enzyme (ACE) in the body according to the text?

Converts angiotensin 1 to angiotensin 2 Signup and view all the answers

What is released by the kidneys and stimulates hematopoiesis according to the text?

Erythropoietin (EPO) Signup and view all the answers

What plays a significant role in regulating vascular homeostasis via sympathetic, parasympathetic, and vasomotor control of vascular tone according to the text?

Autonomic nervous system Signup and view all the answers

What happens when baroreceptor reflexes monitor stretch in vessels according to the text?

Signals sent to medulla oblongata Signup and view all the answers

What response occurs if the right atrium receives more blood than the left ventricle can pump out based on the text?

Atrial reflex activation Signup and view all the answers

What effect does epinephrine have on heart rate and force of contraction according to the information provided?

Increases heart rate and force of contraction Signup and view all the answers

What is one key factor causing hypovolemic shock as per the text?

Hemorrhage or blood loss Signup and view all the answers

Human Circulatory System Overview

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Questions and Answers

Why do arteries and arterioles have thicker walls?

What is the function of venules in the circulatory system?

What is the role of vasa vasorum in blood vessels?

Which layer of a blood vessel contains muscles for vasoconstriction and vasodilation?

What is the function of the external elastic membrane in blood vessels?

Where are nervi vasorum found and what is their function?

Which type of capillary is the least common?

What is the name for the combination of an arteriole and a capillary?

What is the average pressure in arteries known as?

What is the purpose of precapillary sphincters in the circulatory system?

What does a high pulse pressure indicate?

What is the function of venules in the circulatory system?