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  •  What is cardiac output?  Option: 1 Total volume of blood pumped by right auricle

 What is cardiac output?

 

Option: 1

Total volume of blood pumped by right auricle per minute

 


Option: 2

The volume of blood ejected from the left or right ventricle into the aorta (pulmonary trunk) per minute

 


Option: 3

Total volume of blood pumped by the left auricle per minute

 


Option: 4

None of the above

 


Answers (1)

best_answer
  • The volume of blood ejected from the left or right ventricle into the aorta (pulmonary trunk) per minute is called cardiac output
  • Heart of a normal person beats 72 times per minute and pumps out 70 ml of blood per beat
  • It is calculated by the formula

                Cardiac output = Stroke volume x Heart rate
                                        = 70 ml. 72 per min
                                         = 5040 ml per min

  • The stroke volume depends on venous return i.e. the amount of blood delivered to the heart by veins
  • Cardiac output is not constant, it varies with physical activity
  • During vigorous exercise, cardiac output increases as much as 21L per min
  • Hence, the correct answer is option 3. 
Posted by

Ritika Kankaria

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