part 2

Question 1

valves of the heart open and close in response to

Answer 1

pressure changes as the heart contracts and relaxes

Question 2

(tricuspid &
bicuspid

Answer 2

Right and left atrioventricular valves

Question 3

Right and left atrioventricular valves prevent

Answer 3

back flow from the ventricles into the atria

Question 4

Prevent back flow from the arteries into the
ventricles

Answer 4

Right and left semilunar valves (pulmonary & aortic)

Question 5

When one set of valves is open,

Answer 5

the other set is closed

Question 6

Blood flow through coronary
arteries deliver

Answer 6

oxygenated
blood and nutrients to the
myocardium

o Branches arise from the
ascending aorta

Question 7

Coronary veins remove

Answer 7

carbon dioxide and wastes
from the myocardium

Branches converge at the
coronary sinus

Question 8

Myocardial Ischemia

Answer 8

Reduced blood flow to the
myocardium

o Can cause hypoxia
(reduced oxygen supply)
and angina pectoris
(severe pain in the
chest) and pain in the
neck, chin, left arm and
elbow

Question 9

Myocardial Infarction

Answer 9

• Heart attack
  o Infarction refers to death
  of tissues due to
  interrupted blood supply
  o Treatments include
  thrombolytic injection,
  coronary angioplasty or
  coronary artery bypass
  grafting

Question 10

Cardiac muscle cells are self-excitable, and therefore,

Answer 10

autorhythmic

Question 11

• Cardiac muscle cells repeatedly generate spontaneous action
  potentials that then trigger

Answer 11

heart contractions

Question 12

Cardiac muscle cells form the conduction system,

Answer 12

which is the route
for propagating action potentials through the heart muscle