Stroke volume

Question 1

Volume of Blood Pumped per Contraction

Answer 1

stroke volume

Question 2

Stroke volume equation and average

Answer 2

EDV- ESV
Volume of blood before contraction minus volume of blood after contraction

Average = 70 mL (70-kg man at rest)

Question 3

What is cardiac output

Answer 3

A measure of cardiac performance

Volume of blood pumped by one ventricle in a given period of time

Question 4

Cardiac output equation and average of the CO

Answer 4

Cardiac output (CO) = heart rate x stroke volume
Average = 5 L/min

up to 40 L/ per min

Question 5

Role of the autonomic division

Answer 5

modulates heart rate

Question 6

What does parasympathetic system control?

Answer 6

• decreases heart rate
• K+ permeability increases
• Pacemaker potential begins at a lower value
• permeability decreases
  -Slows rate of pacemaker depolarization

Question 7

What does the sympathetic system control?

Answer 7

• increases heart rate
• β1-adrenergic receptors on the autorhythmic cells
  -Na+ and Ca2+ permeability increases

Question 8

Which system normally dominates tonic control

Answer 8

parasympathetic activity

Question 9

Which stimulation decreases heart rate

Answer 9

parasympathetic nerves

Question 10

Which stimulation increases heart rate

Answer 10

sympathetic nerves