The Venous System 20.1 and 20.2 Quiz

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Which layer of blood vessels is mainly composed of smooth muscle and supported by connective tissue?

Tunica intima

External elastic membrane

Internal elastic membrane

Tunica media (correct)

What is the function of vasa vasorum in blood vessels?

Deliver nutrients to large vessels' cells (correct)

Increase blood flow

Maintain blood pressure

Act as valves to prevent backward blood flow

Which feature of arteries helps in maintaining blood pressure?

Large lumens

Thick walls (correct)

Valves

Thin walls

What is the distinct layer of elastic fibers that connects the tunica media in larger arteries?

Internal elastic membrane Signup and view all the answers

What process decreases blood flow and increases blood pressure in blood vessels?

Vasoconstriction Signup and view all the answers

Which tunic of blood vessels is mainly composed of collagenous fibers and some smooth muscle, serving to hold the vessel in position?

Tunica externa Signup and view all the answers

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

To connect capillaries to veins Signup and view all the answers

Why do veins have valves?

To prevent backflow of blood Signup and view all the answers

What is the role of venules and capillaries in diapedesis?

Allowing white blood cells to exit the bloodstream Signup and view all the answers

Which component of blood pressure represents the pressure during ventricular relaxation?

Diastolic pressure Signup and view all the answers

What does a high pulse pressure after strenuous exercise indicate?

Normal physiological response Signup and view all the answers

How is mean arterial pressure (MAP) calculated?

(Systolic pressure + diastolic pressure) / 2 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

Which type of artery has a diameter ranging from 0.1mm to 10mm?

Muscular artery Signup and view all the answers

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

Slow down blood flow to decrease blood pressure Signup and view all the answers

What distinguishes fenestrated capillaries from continuous capillaries?

Permeable to larger molecules Signup and view all the answers

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

Allow blood flow into a capillary bed Signup and view all the answers

What would happen if all precapillary sphincters were continuously open in the body?

Every drop of blood would be in a capillary bed Signup and view all the answers

What is the effect of an increase in cardiac output on blood pressure and blood flow?

Increase in both blood pressure and blood flow Signup and view all the answers

How does the compliance of arteries affect blood pressure and blood flow?

Decreased compliance leads to increased blood pressure and decreased blood flow Signup and view all the answers

What is the impact of hypovolemia (low blood volume) on blood pressure?

Decrease in blood pressure Signup and view all the answers

How do narrower and longer vessels affect resistance, flow, and pressure?

Increase resistance, decrease flow, increase pressure Signup and view all the answers

Where is the correct placement for a cuff when measuring blood pressure with a sphygmomanometer?

Around the arm at the level of the heart Signup and view all the answers