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Continuous Capillaries Structure

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Questions and Answers

What is the main function of the tunica media in arteries?

Allow low-resistance conduction of blood

Control flow into capillary beds

Smooth out blood pressure fluctuations

Active in vasoconstriction (correct)

Which type of artery contains more smooth muscle and less elastic tissue?

Muscular arteries (correct)

Veins

Arterioles

Elastic arteries

What is the function of arterioles in the circulatory system?

Deliver blood to body organs

Lead to major branches near the heart

Smooth out blood pressure fluctuations

Control blood flow into capillary beds (correct)

Which type of capillaries allow only a single red blood cell to pass at a time?

Continuous capillaries Signup and view all the answers

Where can you find pericytes in capillaries?

In the outer surface stabilizing walls Signup and view all the answers

Which arteries have large lumens that allow low-resistance conduction of blood?

Elastic arteries Signup and view all the answers

Which layer of blood vessels is composed of smooth muscle and elastic fibers that are regulated by the sympathetic nervous system?

Tunica media Signup and view all the answers

What is the main function of the tunica externa in blood vessels?

Reinforces and protects vessels Signup and view all the answers

Which type of arteries carries blood away from the heart to all parts of the body except the lungs?

Systemic arteries Signup and view all the answers

The structure of capillaries mainly consists of which of the following?

Endothelium with sparse basal lamina Signup and view all the answers

Which layer of blood vessels is responsible for synthesizing blood cells?

Tunica adventitia Signup and view all the answers

Which type of artery carries blood from the heart to the lungs for oxygenation?

Pulmonary artery Signup and view all the answers

What is a key characteristic of continuous capillaries found in the skin and muscles?

Tight junctions between adjacent cells Signup and view all the answers

Where are fenestrated capillaries most commonly found in the body?

Small intestines and kidneys Signup and view all the answers

What is the primary function of sinusoids in the body?

To allow large molecules to pass between blood and tissues Signup and view all the answers

Which structure regulates blood flow into true capillaries in a capillary bed?

Precapillary sphincter Signup and view all the answers

How are venules different from postcapillary venules?

Postcapillary venules are smaller and composed of endothelium with pericytes Signup and view all the answers

What distinguishes continuous capillaries of the brain from those in the skin and muscles?

Tight junctions surrounding endothelium Signup and view all the answers