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BIO 253 - Quiz 4 | Atcual Exam Questions and Answers with Verified Solutions | Latest Updated 2026

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BIO 253 - Quiz 4 | Atcual Exam Questions and Answers with Verified Solutions | Latest Updated 2026

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BIO 253 - Quiz 4 | Atcual Exam Questions and
Answers with Verified Solutions | Latest
Updated 2026

Epicardium - Outer layer of heart wall
- Thin
- Called visceral pericardium

Myocardium - Middle layer of heart wall
- Cardiac muscle
- Thickest

Endocardium - Inner layer of heart wall
- Thin
- Forms inner lining of all heart chambers

AV (atrioventricular) valves - Between atria & ventricles
- Tricuspid, Mitral (Bicuspid)

SL (semilunar) valves - Separate ventricles & arteries
- Aortic, Pulmonary

Tricuspid valve Prevents blood from moving from right
ventricle
into right atrium during ventricular
contraction

, Mitral valve Prevents blood from moving from left
ventricle into
left atrium during ventricular contraction

Aortic valve Prevents blood from moving from aorta
into left
ventricle during ventricular relaxation

Pulmonary valve Prevents blood from moving from
pulmonary trunk
into right ventricle during ventricular
relaxation

Atria 2 upper chambers of heart

Ventricles 2 bottom chambers of heart

TERM DEFINITION LOCATION
Blood flow of heart: Superior Right atrium
vena cava, inferior vena cava,
coronary sinus to

TERM DEFINITION LOCATION
Blood flow of heart: Right valve
Tricuspid
atrium to

TERM DEFINITION LOCATION
Blood flow of heart: Tricuspid ventricle
Right
valve to

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