Lecture 6 - Cardiovascular and Respiratory Systems

The heart muscle 46 blood vessels anatomy myocardial

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Unformatted text preview: 35 Rep7les circulatory system •  Mostly sedentary life (sporadic burst of energy) –  Breathing : RV distributes more blood to the respiratory system than the RA –  When inac7ve, circulatory system bypass respiratory system and go straight into the body •  DO blood – RV; O blood –LV •  Two aortas –  Lef aorta receives only OB –  Right aorta receives mixed blood •  Blue – Deoxygenated blood •  Red  ­ Oxygenated blood •  Pink – Mixed blood 36 Systemic circuit •  Birds and mammals •  Fully separated respiratory and circulatory systems •  Blood is pumped from the heart to the lungs and back to the heart, and then from the heart to the rest of the body and back to the heart •  Four ­chambered heart –  DB and OB do not mix •  highest oxygen supply to 7ssue •  Blue – Deoxygenated blood •  Red  ­ Oxygenated blood 37 Systemic circuit  ­ humans •  Blood flows from right heart to lungs; lef heart to body •  DO blood from 7ssue enter right ventricle –  Heart relaxes (diastole) •  As heart contracts (systole) blood gets pushed into pulmonary artery –  Gas exchanged •  O blood from lung enter lef ventricle –  Heart relaxes (diastole) •  As heart contracts (systole) blood g...
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This document was uploaded on 03/05/2014.

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