BIO 3302 Lecture Notes - Lecture 3: Turbulence, Apparent Viscosity, Capillary
16 Oct 2017
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Usually slightly shorter and branched connected by gap junctions. Opening of voltage gate sodium channels and then rapid close. Voltage gated calcium channels then open slowly and stay open. As calcium channels close and potassium open --> repolarization. Calcium entry and calcium induces calcium release activate the contractile apparatus. This gives rise to the contraction of muscles. If tetanic contraction - repeated contraction, no rest. Multiply sv * hr = cardiac output (q or vb) Amount of blood pumped by blood per unit time. Volume of blood in heart when it"s full. End systoli is amount of blood left in heart after contraction. Or empty heart more by contracting more strongly. Stretch muscle a little bit --> contracts more strongly. Better overlap of thick and think fibers, mechanical relationship. When atria contract, just top of 20-30% of blood in ventricle. Must maintain venous pressure --> otherwise heart does not fill. Norepinephrine acting on beta1 adrenergic receptors in ventricle.
