뒤로Blood Vessels - Anatomy & Physiology
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Arteries, veins, and capillaries.
To carry blood away from the heart under high pressure.
Veins have thinner walls, larger lumens, and valves to prevent backflow; arteries have thicker muscular walls.
To facilitate exchange of gases, nutrients, and wastes between blood and tissues.
Tunica intima (inner), tunica media (middle), and tunica externa (outer).
The tunica media contains smooth muscle and elastic fibers.
To prevent backflow of blood and assist venous return to the heart.
The pressure in arteries during ventricular contraction.
The pressure in arteries during ventricular relaxation.
The difference between systolic and diastolic pressure.
Elastic arteries (conducting arteries) are closest to the heart.
Arterioles regulate blood flow into capillaries.
Small vessels that supply blood to the walls of large arteries and veins.
Blood pressure decreases progressively from arteries to veins.
Vessel radius (diameter) is the most significant factor affecting resistance.
Venules collect blood from capillaries and drain into veins.
Fenestrated capillaries have pores for increased permeability.
They allow selective exchange of substances and are found in muscle, skin, and the brain.
It returns excess interstitial fluid to the bloodstream and helps maintain fluid balance.
Vasoconstriction increases resistance and raises blood pressure.
Vasodilation decreases resistance and lowers blood pressure.