Physiology 2130 Lecture Notes - Lecture 8: Autonomic Nervous System, Stethoscope, Heart Sounds
1 Jan 2017
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Module 8 circulatory system i: the heart. Heart begins beating before you are born. Beats about 2. 5 billion times and have 160,000 km of blood vessels that transport blood to every cell in body. Central pumping mechanism within the circulatory system. Consists of two side-by-side pumps: right atrium and ventricle pumps blood to the lungs, left atrium and ventricle pumps blood to the rest of the body. Wall of the left ventricle is much thicker than the wall of the right ventricle: left ventricle delivers blood to the entire body so it must contract forcefully to propel the blood through the entire systemic circulation. Right ventricle only propels the blood to the nearby lungs and does not need to contract as forcefully. The valves in the heart (ensure one-way flow of blood) have different names: right atrioventricular (av) valve: tricuspid valve, left atrioventricular (av) valve: bicuspid or mitral valve. The human heart basic structure and functions.
