BIOL 2114 Lecture Notes - Lecture 4: Theca Interna, Tunica Externa, Tunica Intima
Document Summary
Generalized structure of blood vessels: arteries and veins are composed of three layers called tunics, tunica interna, tunica media, tunica externa, lumen, capillaries lamina. Tunics: central blood-containing space surrounded by tunics, are composed of single cell-layer endothelium with the sparse basal. Systemic conduction vessels: as blood leaves the left ventricle to enter into the systemic circulation, it follows a series of vessels through the body until its returns to the right atrium b. c. d. e. f. Types of arteries and arterioles: elastic (aka. Capillaries: capillaries are the smallest blood vessels, walls consisting of a thin tunica interna, one cell thick, allow only a single rbc to pass at a time, capillary beds, a microcirculation of interwoven networks of capillaries. Xii: precapillary sphincter, cuff of smooth muscle that surrounds each true capillary, regulates blood flow into the capillary, blood flow is regulated by vasomotor nerves and local chemical conditions, so it can bypass or flood the capillary bed.
