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A&P 2 Lecture Notes - 2/3

by: Juliana Bernard

A&P 2 Lecture Notes - 2/3 272

Marketplace > University of Massachusetts > Kinesiology > 272 > A P 2 Lecture Notes 2 3
Juliana Bernard
GPA 4.0
Anatomy and Physiology II
Dr. Gordon

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About this Document

Lecture notes from February 3rd - last lecture before exam 1
Anatomy and Physiology II
Dr. Gordon
One Day of Notes
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This 2 page One Day of Notes was uploaded by Juliana Bernard on Wednesday February 4, 2015. The One Day of Notes belongs to 272 at University of Massachusetts taught by Dr. Gordon in Spring2015. Since its upload, it has received 120 views. For similar materials see Anatomy and Physiology II in Kinesiology at University of Massachusetts.


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Date Created: 02/04/15
Tuesday February 3rd 2015 KIN 272 Lecture Notes Heart Blood Flow Flow of the Heart cont from last lecture Deoxygenated blood ows in through the vena cava into the right atrium Once in right atria goes through aplike valve tricuspid valve before entering the right ventricle From the right ventricle it then leaves through the pulmonary semilunar valve pulmonary semilunar valve cusp shaped valve that has 3 half moon shapes that come together with an open center that center will open if uid is forced through the middle and pushes the cusps to the side Blood pushes through pulmonary semilunar valve into pulmonary trunk the pulmonary trunk branches off into 2 main branches right and left pulmonary arteries Blood ows from pulmonary into left and right pulmonary arteries and travels to the lungs Blood is oxygenated in the lungs and then returns into the left atria Once in the left atria goes through another cusp like valve bicuspid valve before entering the left ventricle cusps in bicuspid valve are a bit bigger than tricuspid cusps From the left ventricle blood is pumped out through a cusp shaped valve aortic semilunar valve Aortic semilunar valve brings blood to the aorta to leave the heart aorta is the largest tube leaving the heart it travels up into a hook shape after leaving the left ventricle ascending aorta travels upward arch of the aorta descending aorta rst vessel off of aorta is actually coronary artery Because the coronary artery branch is so small and so close to pulmonary semilunar valve when the heart is at it39s greatest amount of pressurewhen your heart is actually contracting and forcing blood out it is cutting off the coronary arteries When the aorta is filling with blood the coronary arteries are not getting any ow it39s nearly impossible because of their location Unlike any other arteries the coronary arteries get ow when the heart relaxes rather than contracting Right Side of the Heart Left Side of the Heart Pulmonic pushes blood to lungs Systemic pushes blood to the system Low pressure right side only has to push blood High pressure left side has to push heart all over to lungs smaller distance body greater distance Thin muscle walls Thick muscle walls Heart Rate heart beatsminute number of cardiac cyclesminute Cardiac cycle series of events that happens during one heartbeat 1 Passive ventricular filling av valve open sl valve closed venus return is trying to fill the atria but is passively filling ventricle because there is a hole tricuspid valve auricle elasticrubbery extra component of the atrium that increases the surface area expands to accommodate more blood if atria needs more blood if we need more ow during passive filling the auricle will fill up 2 Atrial contraction emptying av valve will close sl valve stays closed atria contracts sending allmost uid into the ventricle 3 Isovolumic contraction av valve forced closed sl valve closed initial contraction of the ventricle not a full force contraction 4 Ventricular contraction ejection av valve closed sl valve open pressure needs to be higher in the ventricle than in the aorta semilunar valve will open when the blood in the aorta from previous beat empties out into system 5 Isovolumic relaxation av valve closed sl valve closed pressure in the aorta recloses sl valve now need to get from step 5 to step 1 again only difference between isovolumic relaxation and passive ventricular filling is the av valve closed The sounds we heart during a heartbeat is the actual force of blood it takes to close the av and SI valve at the end of ventricular ejection Systole contact Diastole relax Stroke volume SV the volume that gets pushed out per beat usually only 60 of volume in ventricle gets pushed out End systolic volume ESV volume still in ventricle at the end of contraction systole End diastolic volume EDV volume in the ventricle at the end of relaxationright before contraction EDV ESV SV Cardiac output the volume that is ejected per minute gt to determine cardiac output you need to know SV and HR SVHR C0


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