Cardiac output. In an animal that has a blood volume of 5 liters, the systemic c
ID: 3483727 • Letter: C
Question
Cardiac output. In an animal that has a blood volume of 5 liters, the systemic circulation co the heart contains approximately 250 ml, and the pulmonary circulation contains a stroke volume was determined to be 70 ml/beat and it heart rate was 75 beats/min. 250 ml, and the pulmonary circulation contains 750 ml. The animals a) How long in seconds will it take for a milliliter of blood leaving the left ventricle to return to the right atrium? b) How long in seconds will it take for a milliliter of blood leaving the right ventricle to return to the left atrium? c) If epinephrine was injected intravenously into this animal, would the transit time from the left ventricle back to the right atrium increase, decrease, or show no change?_ Why? d) if an a-adrenergic antagonist was injected intravenously into this animal, would the transit time from the left ventricle back to the right atrium increase, decrease, or show no change? Why? e) If a nicotinic agonist was injected intravenously into this animal, would the transit time from the left ventricle back to the right atrium increase, decrease, or show no change?_ Why?Explanation / Answer
Answers-
A)- Time in second for blood circulation from left venticle to return the right atrium 10.2 second.
B)- Time in second for blood circulation from right ventrcle to return left atrium 23 second.
C)- Epinephrine injection effect on the time from left ventricle to the right atrium decrease the time. It increase the force of contraction of the heart and it will take less time from left ventricle to the right atrium.
D)- Alfa- adrenergic antagonist injection effect on the time from left ventricle to the right atrium Increase the time. Alfa adrenergic receptors are present on the blood vessles and agonist show vasocontriction effect . The antagonist of alfa adrenergic will cause vasodialation and cause decrease in the time from left ventricle to the right atrium.
E)- Nicotinic agonist effect on the time from left ventricle to the right atrium decrease the time. It is an achetylcholine receptors which has cardiac relaxation property.