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Anatomy of Capillaries

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Questions and Answers

What is the main function of the precapillary sphincter?

To bypass capillaries and provide direct routes between arteries and veins
To aid in the exchange of oxygen and nutrients
To control the flow of blood into capillaries (correct)
To regulate blood pressure

Which type of vein has the same layers as arteries but are less distinct?

All types of veins (correct)
Medium veins
Large veins
Small veins or venules

What is the primary function of venules?

To regulate blood pressure
To bypass capillaries and provide direct routes between arteries and veins
To transport oxygen and nutrients to tissues
To aid in fluid exchange and leukocyte migration (correct)

What is the main component of the tunica media in small and medium-sized veins?

Circular smooth muscle (D) Signup and view all the answers

What is the purpose of pericytes in venules?

To provide structural support to the vasculature (D) Signup and view all the answers

Which of the following is a characteristic of small veins?

Thin intima with a poorly developed media (B) Signup and view all the answers

What is the main function of endothelial cells in venules?

To aid in fluid exchange and leukocyte migration (D) Signup and view all the answers

What is the primary difference between small and medium-sized veins?

The number of layers of smooth muscle in the tunica media (D) Signup and view all the answers

Which of the following is a characteristic of medium-sized veins?

Presence of longitudinal collagen and elastic fibres (C) Signup and view all the answers

What is the primary function of arteriovenous anastomoses?

To bypass capillaries and provide direct routes between arteries and veins (C) Signup and view all the answers