AS_Mammalian_Heart_58f4910b23338.pptx - Mammalian Heart...

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Mammalian HeartChapter 8
Recap…As organism size increasesSA:V ration decreasesTransport systemSystem for rapid transport of gases, nutrients & wastesIn animals, transport system includesBlood vesselsArteries, capillaries and veinsBlood cellsRed blood cellsHeart
Some interesting facts about the heartThe average adult heart beats 72 times a minute; 100,000 times aday; 3,600,000 times a year; and 2.5 billion times during a lifetime.Though weighing only 11 ounces on average, a healthy heartpumps 2,000 gallons of blood through 60,000 miles of bloodvessels each day.A kitchen faucet would need to be turned on all the way for at least45 years to equal the amount of blood pumped by the heart in anaverage lifetimeThe volume of blood pumped by the heart can vary over a widerange, from five to 30 liters per minute.Every day, the heart creates enough energy to drive a truck 20miles. In a lifetime, that is equivalent to driving to the moon andback.Because the heart has its own electrical impulse, it can continue tobeat even when separated from the body, as long as it has anadequate supply of oxygen
Recap…The heart acts as apumpPulmonary circuitHeartlungsheartSystemic circuitHeartbodyheartClosed doublecirculationClosed – blood confined to vesselsDouble – passes the heart twice
Introduction to the Human HeartAdult human heart – 300gSize of your fistBag of muscle– cardiacmuscleFilled with bloodEfficient pump
Cardiac MuscleCells - InterconnectingPlasma membranes very tightly joinedtogetherTo allow waves of electrical excitationtopass easilybetween them
Blood Vessels of The Heart1) Aorta– largestartery- Carries blood upwards towardsthehead& downwards to therest of the body2) Pulmonary artery– branchesinto 2 arteries- bringing blood tothe right& leftlungs
Blood Vessels of The Heart3) Venae cavae– large veins– rightside tube- bringing blood fromhead & body4) Pulmonary veins– left side tube- bring blood backto the heartfromlungs
Blood Vessels of The Heart5) Coronary arteries-Surface(walls) of the heart-Branched from aorta1) Oxygenatedblood2) Nutrients (glucose)To cardiac muscles
Heart ChambersFourchambersSeptum– wall of muscleLeft& rightside of heartUpper– atria/auriclesLower- ventricles
Atria/AuriclesReceiveblood from veinsRightatrium – venae cavaeLeftatrium – pulmonary veinsChannelblood to ventricles
VentriclesReceive blood from atriaChannel blood into arteriesLeftventricleaortabodyRightventriclepulmonaryarterieslungs

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