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Shontae
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Complete the senctece.
____ must stay in constant motion to maintain ________.
Blood, homeostasis
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Describe a CLOSED CIRCUIT.
oxygentated blod and dexoygenated blood doesn't mix
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Describe the PULMONARY CIRCUIT.
- closed circuit
- carries CO2 rich blood
- to lungs
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Describe the SYSTEMIC CIRCUIT.
- closed circuit
- transports O2 rich blood
- to body
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What are the ATRIA for?
collecting blood returning to the heart
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What are the VENTRICLES for?
discharge blood into vessels to leave the heart
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What is the PERICARDIUM?
serous membrane lining pericardial cavity that surrounds heart
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What is the VISCERAL PERICARDIUM?
- simple squamous
- LCT
- covers outer surface of heart
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What is the function of the VISCERAL PERICARDIUM?
lubricate serousmembrane to prevent friction from heart beat
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What is the PARIETAL PERICARDIUM?
- lines inner surface of pericardial sac
- bag-like, loosely arounf heart
- continuous with pericardium
- 2 layer
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What is the function of the PERICARDIAL SAC?
prevent the heart from expanding too much
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Describe the position of the heart.
- slightly to left
- at oblique angle
- rotated left
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Describe the FIBROUS SKELETON.
- FCT
- 4 valves
- does not conduct electrical impulse
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What are the functions of the FIBROUS SKELETON?
atria and ventricles contract separately because of lack of myocardium
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How is an electriacl impulse conducted through the AV NODE?
- 1 AV node in RT atrium gets signal from atria
- 2 passes it to ventricular septum
- 3 initiates ventricular contraction
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What is the PATHWAY of BLOOD through the <3?
- 1blood comes in from body 9pulmonary veins
- 2right atrium 10left atrium
- 3tricuspid valve 11mitral valve
- 4right ventricle 12left ventricle
- 5pulmonary valve 13lungs
- 6pulmonary trunk 14body
- 7R&L pulmonary arteries 15venae cavae
- 8lungs 16<3
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Describe of the CUSPS of the TRICUSPID VALVE.
- 3
- held in place by chordae
- anchored by papillary muscles
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What is the LUB sound of the heart?
closing of AV valves when ventricles contract
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What is the DUP sound of the heart?
semiulnar valves parachute open and seal back to entrance to ventricles
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Describe the CORONARY CIRCUIT.
- 1st thing to come of aorta
- 1st supplied with blood
- arises from ascending aorta
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How does the CORONARY CIRCUIT return to the heart?
through the great cardiac vein
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How does the CORONARY CIRCUIT enter the RT ATRIUM?
through the coronary sinus
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