Physiology 1021 Lecture Notes - Connective Tissue, Baroreflex, Staling
23 Feb 2013
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Homeostasis- maintenance of the internal environment: transports oxygen and nutrients, removes carbon dioxide and waste, regulate ph and body temperature, transports and distributes hormones throughout the body. Roles as a transport system: central pump (heart, closed system of tubes (blood vessels, fluid (blood) Delivers blood for heart to rest of body. Veins= take blood to the heart: systemic circulation. Total blood volume (tbv)= 5 liters of blood. System arteries/arterioles= 10% (distribution vessels- distribute blood) Two types of myocardial cells: contractile cells, specialized nodal/ conducting cells. Contains similar contractile proteins (actin and myosin) Extract 80% of the oxygen from the blood. Ca+2 release from sr triggers contractions mitochondria lots of atp. Joined by intercalated discs that contain gap junction: gap junctions: allow movement of ionic currents (aps) between cells. Shows gap junctions allow action potential to travel through from one side to the next.
