V

Varicosities, 93

Vasa recta, 312, 325-326

Vascular resistance, 199-200

Vasoconstriction, 195, 233-234, 338 Vasoconstrictors, 208-210 Vasodilation, 195 Vasodilators, 211-212, 334 Vasomotion, 220 Vasomotor center baroreceptors effect on, 205 chemoreceptors effect on, 207-208 description of, 203-204 low-pressure receptors effect on, 208 Vasomotor tone, 203-204 Vasopressin, see Antidiuretic hormone Veins, 197, 213-216 Venae cavae, 165, 197 Venous return, 186, 213-216 Venous system, 164 Ventilation alveolar, 256-257 definition of, 254 exercise-related response, 275-276 lung volumes, 254-255 regulation of, 269, 271-275 total, 256 Ventilation-perfusion matching,

261-263 Ventral respiratory group, 271 Ventral root, of spinal nerves, 65 Ventricular contraction, 177, 179 Ventricular filling, 177 Venules, 197 Verapamil, 176, 211 Vertebral column, 64 Vestibulocerebellum, 58 Vestibulospinal tract, 69 Visceral pain, 85 Viscosity of blood, 200 Vital capacity, 256 Vitamin B12, 293 Vitamin D3, 132 Voltage-gated ion channels calcium channels, 36, 161 description of, 25, 27 potassium channel, 28 sodium channel, 25, 27, 32 V/Q ratio, see Ventilation-perfusion matching

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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