Complete the senctece.
____ must stay in constant motion to maintain ________.
Describe a CLOSED CIRCUIT.
oxygentated blod and dexoygenated blood doesn't mix
Describe the PULMONARY CIRCUIT.
carries CO2 rich blood
Describe the SYSTEMIC CIRCUIT.
transports O2 rich blood
What are the ATRIA for?
collecting blood returning to the heart
What are the VENTRICLES for?
discharge blood into vessels to leave the heart
What is the PERICARDIUM?
serous membrane lining pericardial cavity that surrounds heart
What is the VISCERAL PERICARDIUM?
covers outer surface of heart
What is the function of the VISCERAL PERICARDIUM?
lubricate serousmembrane to prevent friction from heart beat
What is the PARIETAL PERICARDIUM?
lines inner surface of pericardial sac
bag-like, loosely arounf heart
continuous with pericardium
What is the function of the PERICARDIAL SAC?
prevent the heart from expanding too much
Describe the position of the heart.
slightly to left
at oblique angle
Describe the FIBROUS SKELETON.
does not conduct electrical impulse
What are the functions of the FIBROUS SKELETON?
atria and ventricles contract separately because of lack of myocardium
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
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
Describe of the CUSPS of the TRICUSPID VALVE.
held in place by chordae
anchored by papillary muscles
What is the LUB sound of the heart?
closing of AV valves when ventricles contract
What is the DUP sound of the heart?
semiulnar valves parachute open and seal back to entrance to ventricles
Describe the CORONARY CIRCUIT.
1st thing to come of aorta
1st supplied with blood
arises from ascending aorta
How does the CORONARY CIRCUIT return to the heart?
through the great cardiac vein
How does the CORONARY CIRCUIT enter the RT ATRIUM?
through the coronary sinus
Exam 5 Ch. 21