. Advanced biology. Biology; Physiology; Reproduction. CAPILLARIES 157 III. Lie down or sit quietly for two or three minutes. Again record the pulse rate. A. What is the effect of rest on the heart and arterial muscles? IV. What is the value of the arterial pulse ? V. If more blood is needed in one part of the body than in another, how can it be properly distributed ? The normal pulse rate in men is seventy-two beats per minute, for women seventy-six. The pulse rate is still higher in children. An abnormal pulse indicates some sort of unusual physiological condition. aj?«^si Capillaries. The c
. Advanced biology. Biology; Physiology; Reproduction. CAPILLARIES 157 III. Lie down or sit quietly for two or three minutes. Again record the pulse rate. A. What is the effect of rest on the heart and arterial muscles? IV. What is the value of the arterial pulse ? V. If more blood is needed in one part of the body than in another, how can it be properly distributed ? The normal pulse rate in men is seventy-two beats per minute, for women seventy-six. The pulse rate is still higher in children. An abnormal pulse indicates some sort of unusual physiological condition. aj?«^si Capillaries. The capillaries are microscopic tubes found among the cells of the tissues. These vessels are characterized by a lack of muscular tis- sue. Their walls are mevi- hranous. They receive the blood from the arteries and send it to the veins. Materials pass from the blood through the thin walls of the capillaries to the cells in surrounding tissues. The waste prod- ucts in the lungs and other parts of the body pass into the blood from which they are later dis- charged. This inter- change of products is _ .„ . ^- a .u . .u ® ^ Capillaries are so tiny and numerous that they possible because of the traverse the most minute parts of the body. The red ^ corpuscles pass through in practically single file. membranous walls of the capillaries. The blood receives enough of an impulse from the heart to keep it moving through the capillaries. Veins. The veins receive the blood from the capillaries and return it to the heart. The veins connected directly with the capillaries. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wheat, Frank Merrill; Fitzpatrick, Elizabeth T. New York ; Boston [etc. ] : American Book Company
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