English for doctors. Capillaries (most important)

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English for doctors. Capillaries (most important)

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24. Capillaries

Capillaries are thin-walled, narrow-diameter, low-pressure vessels that generally permit easy diffusion across their walls. Most capillaries have a cross-sectional diameter of 7 -12 mm. They are composed of a simple layer of endothelium, which is the lining of the entire vascular system, and an underlying basal lamina. They are attached to the surrounding tissues by a delicate reticu-lum of collagen. Associated with these vessels at various points along their length are specialized cells called pericytes. These cells, enclosed within their own basal lamina, which is continuous with that of the endothelium, contain contractile proteins and thus may be involved in the control of capillary dynamics. They may also serve as stem cells at times of vascular repair. Capillaries are generally divided into three types, according to the structure of their endothelial cell walls.

Continuous (muscular, somatic) capillaries are formed by a single uninterrupted layer of endothelial cells rolled up into the shape of a tube and can be found in locations such as connective tissue, muscle, and nerve.

Fenestrated (visceral) capillaries are characterized by the presence of pores in the endothelial cell wall. The pores are covered by a thin diaphragm (except in the glome-ruli of the kidney) and are usually encountered in tissues where rapid substance interchange occurs (eg, kidney, intestine, endocrine glands).

Sinusoidal capillaries can be found in the liver, hematopoietic and lymphopoietic organs, and in certain endocrine glands. These tubes with discontinuous endothelial walls have a larger diameter than other capillaries (up to 40 mm), exhibit irregular cross-sectional profiles, have more tortuous paths, and often lack a continuous basal lamina. Cells with phagocytic activity (macropha-ges) are present within, or just subjacent to, the en-dothelium.

new words

capillaries - capillaries

to thin-walled - surrounded by a thin wall

narrow-diameter - narrow diameter

low-pressure - low pressure

that - that

generally - mostly

permit - permission easy - easy

diffusion - diffusion

cross-sectional - transverse

to be composed - to be complicated

simple - simple

endothelium - endothelium

lining - alignment

entire - all

vascular - vascular

underlying - underlying

basal - basic

lamina - thin plate

Author: Elena Belikova

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