Lecture 6 - Cardiovascular and Respiratory Systems

Faster acetylcholine is released to pacemaker cells

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Unformatted text preview: ets pushed into Aor7c valve –  Tissue 38 Systemic circuit  ­ humans hlp://www.hhmi.org/biointerac7ve/heart ­func7on 39 Heart valves •  Atrioven7cular valves prevents backflow into the atria when the ventricles contract (systole) •  The pulmonary and aor7c valve prevent blood backflow into the ventricles when heart relaxes (diastole) 40 Blood vessels’ anatomy •  Higher blood pressure at arteries than veins •  Blood velocity decreases (surface area increases) as it goes to capillaries as this increases the gas exchange rate. •  Capillaries are so small that allows only one cell at a 7me 41 Blood vessels’ anatomy •  Anatomy of blood vessels is adjusted for blood pressure –  Arteries have thicker walls than the veins as they need to work under higher blood pressures 42 Blood vessels’ anatomy 43 Blood vessels’ anatomy •  Valves prev...
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