18 Questions
What is the main function of the tunica media in arteries?
Active in vasoconstriction
Which type of artery contains more smooth muscle and less elastic tissue?
Muscular arteries
What is the function of arterioles in the circulatory system?
Control blood flow into capillary beds
Which type of capillaries allow only a single red blood cell to pass at a time?
Continuous capillaries
Where can you find pericytes in capillaries?
In the outer surface stabilizing walls
Which arteries have large lumens that allow low-resistance conduction of blood?
Elastic arteries
Which layer of blood vessels is composed of smooth muscle and elastic fibers that are regulated by the sympathetic nervous system?
Tunica media
What is the main function of the tunica externa in blood vessels?
Reinforces and protects vessels
Which type of arteries carries blood away from the heart to all parts of the body except the lungs?
Systemic arteries
The structure of capillaries mainly consists of which of the following?
Endothelium with sparse basal lamina
Which layer of blood vessels is responsible for synthesizing blood cells?
Tunica adventitia
Which type of artery carries blood from the heart to the lungs for oxygenation?
Pulmonary artery
What is a key characteristic of continuous capillaries found in the skin and muscles?
Tight junctions between adjacent cells
Where are fenestrated capillaries most commonly found in the body?
Small intestines and kidneys
What is the primary function of sinusoids in the body?
To allow large molecules to pass between blood and tissues
Which structure regulates blood flow into true capillaries in a capillary bed?
Precapillary sphincter
How are venules different from postcapillary venules?
Postcapillary venules are smaller and composed of endothelium with pericytes
What distinguishes continuous capillaries of the brain from those in the skin and muscles?
Tight junctions surrounding endothelium
Test your knowledge on the structure of continuous capillaries in different parts of the body, including the skin, muscles, and the brain's blood-brain barrier. Learn about the unique features of continuous capillaries and their functions.
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