Cardiac Output

During exercise, an athlete will likely

• Decrease ejection fraction

• Release acetylcholine from parasympathetic nerves near the heart

• Increase EDV

• Decrease venous return

Calculate the Cardiac output

SV= 70 ml/beat

HR = 75 beats/min

• 5 L/min

• 5.25 L/min

• 5.5 L/min

• 5.35 L/min

Cardiac output increases during exercise.

• True

• False

Tags

NGSS.HS-LS1-3

Cardiac output is affected by

• age/ gender/ body size

• oxygen demand of body

• viscosity of blood

Tags

NGSS.HS-LS1-3

Which of the following causes an increase in cardiac output?

• Increase in contractility and decreased in preload

• increase in afterload

• increase in both contractility and preload

• increased in preload and decrease in contractility

Conditions that reduce cardiac output include

• eating

• heart disease

• standing from lying position

• adrenaline

Tags

NGSS.HS-LS1-3

If heart rate increases to 180 beats/min (which is very fast) from the original 70 beats/min and stroke volume remains 70mL/beat the cardiac output increases from 4.9L/min to

• 12,600 mL/minute

• 12.6 L/min

• 13 mL/sec

• 13 mL/hr

What is the formula for calculating cardiac output?

• Cardiac Output = Heart Rate x Stroke Volume

• Cardiac Output = Stroke Volume / Heart Rate

• Cardiac Output = Heart Rate - Stroke Volume

• Cardiac Output = Heart Rate + Stroke Volume

Which of the following factors can directly increase cardiac output?

• Increased heart rate

• Decreased stroke volume

• Decreased blood pressure

• Increased blood viscosity

During intense physical activity, what happens to cardiac output?

• It decreases

• It remains the same

• It increases

• It fluctuates randomly

Tags

NGSS.HS-LS1-3