Transcription of Ch 14: Cardiovascular Physiology
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Ch 14: Cardiovascular Physiology
ch 14 : Cardiovascular Physiology , Part 1 Fluid flow APs in contractile & autorhythmic cells Cardiac cycle (elec. & mech. events) HR regulation Stroke volume & cardiac output concepts: Running Problem: Heart Attack Developed by John Gallagher, MS, DVM Overview of Cardiovascular System 3 basic components: ? The heart is a dual pump! Circulation Review Fig 14-1 Blood Flow Why does blood flow through Cardiovascular system? (teleological vs. mechanistic answers) Teleological: Because diffusion is too slow to support a large and complex organism Mechanistic: Because the contractions of the heart produce a hydrostatic pressure gradient and the blood wants to flow to the region of lesser pressure. Therefore, the Pressure gradient ( P) is main driving force for flow through the vessels Blood Flow Rate P/ R Fig 14-2 Fig 14-4 Pressure Hydrostatic pressure is in all directions Measured in mmHg: The pressure to raise a 1 cm column of Hg 1 mm Sphygmomanometer Flow is produce by Driving Pressure Pressure of fluid in motion decreases over distance because of energy loss due to friction Blood Flow Rate P/ R Plumbing 101: Resistance Opposes Flow 3 paramet
Blood Flow Why does blood flow through cardiovascular system? (teleological vs. mechanistic answers) Teleological: Because diffusion is too slow to support a large and complex organism Mechanistic: Because the contractions of the heart produce a hydrostatic pressure gradient and the blood wants to flow
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