Physiology 1021 Lecture 7: 7 - Cardiovascular Physiology
29 Nov 2016
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Document Summary
Transports oxygen and nutrients to the tissues of the body: removes carbon dioxide and waste products from the tissues, regulates body temperature and ph. Transports and distributes hormones and other substances throughout the body. Cardio(cid:448)as(cid:272)ular s(cid:455)ste(cid:373)"s role as a tra(cid:374)sport s(cid:455)ste(cid:373: a central pump the heart, a closed system of blood vessels. The fluid medium (blood) through which various substances are transported. Contains two circulatory systems - pulmonary circulation and systemic circulation. Total blood volume distribution (tbv: normal tbv in humans is 5-6 liters, heart and pulmonary circulation 15% Systemic veins and venules (capacitance vessels) 70% Myocardial cells provide a self-excitatory system for the heart to generate impulses and a transmission system for rapid conduction of impulses throughout the heart: contractile cells (beating of the heart) Striated: contain similar contractile proteins (actin/myosin, ca++ release from sr triggers contraction. Nodal and conducting cells of the heart: contain few contractile proteins.
