Question

Which of the following would most likely reduce mean arterial pressure (MAP)?

a. increased inotropism              

b. increased vasodilation

c. increased venous return       

d. increased cardiac output

e. increased plasma colloid osmotic pressure

Answer 1

Answer B) Increased Vasodilation

explanation--->Vasodilation result in increase in blood flow to tissues by decreasing the arterial pressure .Vasodilation is due to Decrease in total perpheral resistance resulting in blood flow

Diastolic Blood pressure is dependent on Total peripheral resistance .So MAP is dependent on Total peripheral resistance if resistance increased then Diastolic Blood pressure increased Also MAP increased .

Mean arterial pressure =

​​​​1/3 Rd Systolic pressure+ 2/3 Rd Diastolic pressure .

Normal Blood pressure is 120 /80

MAP Is Dependent on Systolic and Diastolic Blood pressure .

A)Increase inotropism increase force of contraction increase Cardiac output increase Mean arterial pressure by raising Systolic Blood pressure .

C) Increased venous return result Increase in End Diastolic volume more stretching of heart walls and heart contract more forcefully as per starling Law causing Increase in Cardiac output and increase Blood pressure .

D) Cardiac output is the amount of blood pumped by Ventricles In each beat .Cardiac output = Heart rate x stroke volume .Systolic Blood pressure depend upon Cardiac output .SO MAP also depends upon Cardiac output of Cardiac output Increase then MAP also increase

E) Increased Plasma colloid osmotic pressure result in more amount of blood in vessels thus increasing the Mean Arterial pressure .