Heart Physiology Biol 3320
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This 4 page Class Notes was uploaded by Caitlin Gill on Saturday January 16, 2016. The Class Notes belongs to Biol 3320 at Bowling Green State University taught by Lee Meserve in Fall 2015. Since its upload, it has received 60 views. For similar materials see Human Anatomy and Physiology II in Biology at Bowling Green State University.
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Date Created: 01/16/16
January 19, 2016 Heart Physiology Muscle Types names represent the location where the different muscles are found, important for the functions of the heart Atrial muscles are very thin, ventricle muscles are important for getting the blood out of the ventricle and into the aorta (left ventricle is thicker than other bc it doesn’t have to push blood as far) Visceral Muscle found in the walls of your organs (visceral), found in GI tract, blood vessels, urinary bladder “Smooth” Muscle microscopic is very homogenous, no visible stripes spindle shaped, and one nucleus Involuntary you do not determine when these muscles contract and relax, brain does Skeletal Muscle this is attached to the skeleton, the same muscles are attached to one bone and then attached to another bone, also to the cartilages in your ears, and outside of eyes and skin myosin (thick protein) fibers are oriented in spaces run the entire length of a given muscle (very long) Striated (Striped) Muscle can see visible stripes up and down the muscle Voluntary you can move the muscles are you please, parts of your brain that can move your muscles as you are sleeping Cardiac Muscle found in the myocardium of the heart Striated Muscle can see visible stripes The “Most” Involuntary contracts and relaxes without getting the message from the brain, does this spontaneously, fibers are branched Spontaneous Generation of Contraction no nerve impulses Rate of Contraction Varies with Area of Heart depolarize for 3 tenths of a second, repolarize for 4 tenths of a second, left atrium is slower than right atrium, and ventricle is the slowest Coordination of Contraction Specialized Coordinating Structures 1. Sinoatrial (SA) Node wall of right atrium, pacemaker, depolarize/repolarize most rapidly, nervous system input to how fast this will happen 2. Atrioventricular (AV) Node wall of the right atrium toward the bottom and between right and left atrium 3. Atrioventricular Bundle (of His) wall between the two ventricles, branches and then end at the ventricles and attached to chordae tendons, carries electrical impulse from atrial muscle to ventricular muscle 4. Purkinje Fibers distributes excitation through ventricular myocardium Electrocardiogram illustration/graph of the flow of electricity through the heart (EKG) Heart Activity Measured at Body Surface 8 tenths of a second P Wave represents depolarization of the muscle tissue in the wall of the atrium (SA node, atriums, AV node) QRS Complex depolarization of the ventricular muscle tissue T Wave represents repolarization of the ventricular muscle *** Atrial repolarization is not seen because it happens at the same time of ventricular depolarization and it is very small you can’t see *** Put It All Together Cardiac Cycle IN OUT + + sodium ions + + Isovolumetric when your heart muscles are contracting and all valves are closed When ventricular muscle relaxes it’s in diastole. (80mmHg) First heart sound is a result of the av valves closing. Blood is flowing from atrium to ventricle and to ventricles and the blood hits the valves stopping of blood flow against the valves LUB when semilunar valves open and the blood flows into the aortabut the ventricle relaxes and blood tries to flow back but the semilunar valves close and the blood hits against it DUB
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