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 Heart•Heart function = key factor in body function•Health Issues – Heart problems are one of the leading causes of death in the US•Primary function–Blood circulation–There must be enough force generated to send blood to every single cell•As A Pump–Pumps 1835 gallons of blood a day–Through 60,000 miles of blood vessels20-3Functions of the Heart•Generating bloodpressure•Routing blood: separates pulmonary and systemic circulations•Ensuring one-way bloodflow: valves•Regulating bloodsupply–Changes in contraction rate and force match blood delivery to changing metabolic needs20-5Heart - Location•Remember those body cavities….?•Mediastinum = the cavity between the lungs–Holds•Trachea•Thymus•Pericardial cavity•Inside the pericardial cavity…–Heart + Pericardium2/6/0820-7Size, Shape, Location of the Heart•Size of a closed fist•Shape–Apex: Blunt rounded point of cone–Base: Flat part at opposite of end of cone•Located in thoracic cavity in mediastinum–Important clinically when using a stethoscope, performing an ECG, or performing CPR20-8Heart Cross Section•Pericardial cavity–Sac enclosing the heart–Formed by membrane = pericardium–This is the lining of the pericardial cavity•Pericardium = 3 layers–Visceral pericardium•Layer closest to the heart–Parietal pericardium•On top of visceral–Fibrous pericardium•Outermost layer – made up of collagen fibersHeart - Anatomy•Pericardial cavity–Between the parietal and fibrous layers = pericardial fluid•Pericardium –Is like a plastic bag with fluid–Covers the heart, cushions it & anchors it in placeHeart - Anatomy•The fibrous layer of the pericardium attaches to the diaphragm•Fluid between layers prevents friction when the heart beats•Very important structure–Protects & anchors – therefore it helps it function•Damage to the pericardium can be serious...
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This note was uploaded on 03/21/2011 for the course BIOLOGY 1120 taught by Professor Chapman during the Spring '11 term at Georgia State.

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

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