2_Cardio_Heart%20Ch%2020

2_Cardio_Heart%20Ch%2020 - 20-1Chapter 20Cardiovascular...

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Unformatted text preview: 20-1Chapter 20Cardiovascular SystemThe Heart20-2Functions of the HeartHeart function = key factor in body functionHealth Issues Heart problems are one of the leading causes of death in the USPrimary functionBlood circulationThere must be enough force generated to send blood to every single cellAs A PumpPumps 1835 gallons of blood a dayThrough 60,000 miles of blood vessels20-3Functions of the HeartGenerating bloodpressureRouting blood: separates pulmonary and systemic circulationsEnsuring one-way bloodflow: valvesRegulating bloodsupplyChanges in contraction rate and force match blood delivery to changing metabolic needs20-5Heart - LocationRemember those body cavities.?Mediastinum = the cavity between the lungsHoldsTracheaThymusPericardial cavityInside the pericardial cavityHeart + Pericardium2/6/0820-7Size, Shape, Location of the HeartSize of a closed fistShapeApex: Blunt rounded point of coneBase: Flat part at opposite of end of coneLocated in thoracic cavity in mediastinumImportant clinically when using a stethoscope, performing an ECG, or performing CPR20-8Heart Cross SectionPericardial cavitySac enclosing the heartFormed by membrane = pericardiumThis is the lining of the pericardial cavityPericardium = 3 layersVisceral pericardiumLayer closest to the heartParietal pericardiumOn top of visceralFibrous pericardiumOutermost layer made up of collagen fibersHeart - AnatomyPericardial cavityBetween the parietal and fibrous layers = pericardial fluidPericardium Is like a plastic bag with fluidCovers the heart, cushions it & anchors it in placeHeart - AnatomyThe fibrous layer of the pericardium attaches to the diaphragmFluid between layers prevents friction when the heart beatsVery important structureProtects & anchors therefore it helps it functionDamage to the pericardium can be serious...
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2_Cardio_Heart%20Ch%2020 - 20-1Chapter 20Cardiovascular...

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