MCB 246 Heart Lectures I-III Questions With Complete
Solutions
3 layers of pericardium Correct Answers fibrous, parietal and
visceral layer of serous pericardium
4 valves Correct Answers right and left AV valves, pulmonary
and aortic semilunar valves
aorta Correct Answers transports blood from LV
arteries Correct Answers carry blood Away from heart
atrial (Bainbridge) reflex Correct Answers protects heart from
overfilling, baros stimulated by increased venous return
autonomic reflexes Correct Answers baro and chemoreceptors
send signals to cardiac center, cardiac center influences
para/sympathetic systems to alter CO as needed
autorhythmicity Correct Answers spontaneous firing
AV bundle/ Bundle of His Correct Answers divides into L and
R bundles between ventricles
AV node Correct Answers receives input from SA node
basic pattern of circulation Correct Answers RH -> lungs -> LH
-> body -> RH
, beta-blocker drugs (negative) Correct Answers interfere with
EPI and NE binding to beta receptors
bradycardia Correct Answers <60bpm
caffeine (positive) Correct Answers inhibits breakdown of
cAMP
capillaries Correct Answers gas exchange sites (blood to
air/body cells)
cardiac cells at rest contain Correct Answers Na+/K+ pumps,
Ca2+ pumps, Na+ and K+ leakage channels
cardiac center of medulla oblongata CONTAINS Correct
Answers cardioacceleratory and cardioinhibitory centers
cardiac center of medulla oblongata INFLUENCES Correct
Answers heart contraction rate and force (modifies, does not
initiate)
cardiac center of medulla oblongata RECEIVES from Correct
Answers baro and chemo receptors in CV system
cardiac center of medulla oblongata SENDS via Correct
Answers sympathetic and parasympathetic pathways
cardiac muscle around fibrous skeleton Correct Answers spiral
arrangement: atria move in and ventricles move up
Solutions
3 layers of pericardium Correct Answers fibrous, parietal and
visceral layer of serous pericardium
4 valves Correct Answers right and left AV valves, pulmonary
and aortic semilunar valves
aorta Correct Answers transports blood from LV
arteries Correct Answers carry blood Away from heart
atrial (Bainbridge) reflex Correct Answers protects heart from
overfilling, baros stimulated by increased venous return
autonomic reflexes Correct Answers baro and chemoreceptors
send signals to cardiac center, cardiac center influences
para/sympathetic systems to alter CO as needed
autorhythmicity Correct Answers spontaneous firing
AV bundle/ Bundle of His Correct Answers divides into L and
R bundles between ventricles
AV node Correct Answers receives input from SA node
basic pattern of circulation Correct Answers RH -> lungs -> LH
-> body -> RH
, beta-blocker drugs (negative) Correct Answers interfere with
EPI and NE binding to beta receptors
bradycardia Correct Answers <60bpm
caffeine (positive) Correct Answers inhibits breakdown of
cAMP
capillaries Correct Answers gas exchange sites (blood to
air/body cells)
cardiac cells at rest contain Correct Answers Na+/K+ pumps,
Ca2+ pumps, Na+ and K+ leakage channels
cardiac center of medulla oblongata CONTAINS Correct
Answers cardioacceleratory and cardioinhibitory centers
cardiac center of medulla oblongata INFLUENCES Correct
Answers heart contraction rate and force (modifies, does not
initiate)
cardiac center of medulla oblongata RECEIVES from Correct
Answers baro and chemo receptors in CV system
cardiac center of medulla oblongata SENDS via Correct
Answers sympathetic and parasympathetic pathways
cardiac muscle around fibrous skeleton Correct Answers spiral
arrangement: atria move in and ventricles move up
