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Heart Physiology

by: Caitlin Gill

Heart Physiology Biol 3320

Caitlin Gill

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these notes cover the heart physiology in exam 1
Human Anatomy and Physiology II
Lee Meserve
Class Notes
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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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