Ch 42 Circulation - Chapter 42 Circulation &...

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Unformatted text preview: Chapter 42 Circulation & Gas Exchange Functions of the Circulatory System Transport oxygen to cells Transport nutrients from the digestive system to body cells Transport hormones to body cells Transport waste from body cells to excretory organs Distribute body heat Gastrovascular Cavity of Aurelia Open Circulatory System Closed Circulatory System Atrium Ventricle Circulatory Systems in Fish, Amphibian, & Mammal Ectotherms Endotherm P = atrial depolarization ~ 0.1 sec atria contracts QRS = ventricular depolarization ventricles contract ( lub ), contraction stimulated by Ca ++ uptake T = ventricular repolarization ventricles relax ( dub ) Electrocardiogram (ECG) Artery Vein Valve Tunica intima Tunica media Tunica externa Artery vein Arteries Carry blood away from the heart. Thick-walled to withstand hydrostatic pressure of the blood during ventricular systole. Blood pressure pushes blood through arteries. Veins Carry blood to the heart. Thinner-walled than arteries. Possess one-way valves that prevent backwards flow of blood. Blood flow due to body movements, not from blood pressure. One-Way Valves in Veins Capillaries capillary vessel capillary vessel venule venule capillaries capillaries arteriole arteriole arteriole venule lymphatic capillaries blood capillaries lymphatic vessel Lymph Transport Lymph Transport lacks pump for circulation relies on activity of skeletal muscles and pulsation of nearby arteries for movement of fluid 3L of lymph enters blood stream every 24 hrs proteins easily enter lymphatic system uptake of large particles such as cell debris, pathogens, and cancer cells lymph nodes where it is cleansed of debris and examined by cells of the immune system (WBC) Formation of Lymph interstitial fluid blood capillary lymphatic capillary tissue cell Sphygnomamometer...
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Ch 42 Circulation - Chapter 42 Circulation &...

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