Textbook Notes (369,067)
Canada (162,366)
HLTC22H3 (102)
Anna Walsh (49)

HLTB01 Ch6 notes

10 Pages

Health Studies
Course Code
Anna Walsh

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Chapter 6 Aging of the Internal OrgansCardiovascular System bodys main transporter systemSends supplies such as fluids nutrients hormones oxygen and antibodiesRemoves waste products such as carbon dioxide and hydrogen ions Composed of heart blood vessels arteries arterioles capillaries veins and venules and bloodArteries carry blood away from heart and veins carry blood to the heart Blood o Composed of water red and white blood cells and platelets as well as nutrients such as fat globules carbs and proteins o Carries electrolytes to help maintain acidbase balance and chemicals hormones NT peptide necessary to regulate homeostasis cognition movement and functionHeart o Located behind chest wall in slanted positiono Enclosed in fibrous sac called pericardium o Two upper chambers atria collect blood and two lower chambers ventricles pump blood to lungs and body o Atriathin walled Ventricles thicker more muscular long distance pumpingo xygen poor blood is collected in right atrium from large veins superior and inferior vena cava o Than flows to right ventricle and pumped via pulmonary arteries in capillary system of the lungs for carbon dioxide and oxygen exchange o xygen rich blood is sent via pulmonary veins to the left atrium where flows to left ventricle and is pumped out through the aorta o Blood from aorta flows into large arteries and than to the smaller arteries arterioles and capillarieso Venules collect blood from capillaries and move it into larger veins until it reached superior and inferior vena cava o Veins serve as a huge reservoir for the bodys blood supply as 64 of its volume found in veins o Arteries composed of smooth muscle elastic fibres and collageno in healthy heart oxygen poor blood is never mixed with oxygen rich blood o beat is started in sinoatrial node or pacemaker and in upper part of right atrium o signal spreads down the heart through the atrial myocardium to reach atrioventrical node o them impulse is conducted to atrioventricular bundle and to the parkinje fibres where it is sent to both ventricles o as signal moves down contraction of cardiac or heart muscle occurs contraction systolic relaxation diastole asystoleno heart beat o lub when valves between atria and ventricles close and ventricles contract o dub when closure of valves between the ventricles and the large arteries pulmonary and aorta o Carotid artery on neck and radial pulse on outer edge of wrist is familiar spoto Top of Foot pedal pulse and back of knee popliteal pulse o Veins have valves eg Great saphenous found in the back of legs o Flapper valve forcing blood flow in one direction toward heart
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