BIOL 1102 Lecture Notes - Lecture 8: Cholesterol, Embolism, Lipoprotein
Document Summary
Cardiovascular or circulatory system: pump and system of tubes that circulate blood throughout the body. Blood: two parts: blood plasma and blood cells (1-1. 5 gallons: respiratory pigments: proteins in blood cells that carry gases. Into the lymphatic system (part of the immune system) Hemolymph: mix of blood and interstitial fluid: found in animals with open circulatory system. Open vs closed circulatory systems: open circulatory system: hemolymph usually outside vessels. Works well for small animals: closed circulatory system: blood cells never leave blood vessels (interstitial fluid does) Control blood flow by controlling vessel diameter. Valves to prevent backflow: vasodilation: vessel muscle relaxes, vessel gets bigger, blood pressure goes down. Histamines, lactic acid, too much co2, ethanol, thc, hot temperatures: vasoconstriction: vessel muscles tighten, vessels get smaller, blood pressure goes up. Antihistamines, amphetamines, cocaine, eye drops (visine), nicotine, cold. Some problems with the heart and cardiovascular system temperatures: heart murmur: abnormal sounds heard during heartbeat.
