HSCI 211 Lecture Notes - Lecture 8: Fibrous Cap, Chronic Kidney Disease, Heart Failure
Document Summary
Week 8 hsci 211 circulatory system and blood pressure. Venous blood flow: same as arterial system reverse, small thin venules, blood begins @ low pressure, skeletal muslces & respiratory pump move it, valves prevent backflow. Edema: swelling: accumulation of fluid in interstitial space , edema varies w/ capillary exchange, inadequate lymph drainage, filtration > absorption. Blood pressure: systolic pressure: ventricles contracting, diastolic pressure: ventricles relaxing (yet there is still pressure in the arteries, 124/84 is the wanted systolic-diastolic blood pressure. Factors affecting blood pressure: blood volume, raise intake of fluids, blood loss, arterial-venous blood distribution, heart pump effectiveness, resistance in the blood vessels, mainly in the arterioles: length of the circulation, blood viscosity, radius of the blood vessels. Blood pressure regulation: movement to movement: cns control (relates to breathing centres & body fluid balance, purpose: a. i. Blood pressure measures devices: sphygmomanometer, aneroid manometers, digital devices, ambulatory bp monitors. Effect of hypertension: on the heart: myocardial infarction.
