Lecture 11

Question 1

Describe the path of blood through the heart?

Answer 1

vena cava to right atrium- right ventricle to lungs- pulmonary vein to left atrium- left ventricle to systemic circuit

Question 2

How is the systemic circuit designed so that cardiac output can be distributed to all organs?

Answer 2

Parallel branching of arterial network

Question 3

When at rest? Where does the majority of blood go in systemic circulation?

Answer 3

• kidney
• abdominal viscera
• skeletal muscle

Question 4

Which organs get decreased blood flow during excersise?

Answer 4

• kidneys
• abdominal viscera
• other tissues

Question 5

Which organs get increased blood flow during excersise?

Answer 5

• heart
• skin
• skeletal muscle

Question 6

How is MAP controlled during excersise?

Answer 6

• CO increases but TPR decreases

Question 7

What is the role of Precapillary sphincters?

Answer 7

Control blood flow out of arterioles to maintain MAP for different cardiac output

Question 8

What is the equation for resistance for blood flow and vessel radius?

Answer 8

R= 1/r^4 = 1/ ( o.5d)^4

Question 9

What is vasodilation?

Answer 9

Increasing luminal space, decreasing resistance and increasing flow

Question 10

What is vasoconstriction?

Answer 10

Decreasing luminal space, increasing resistance and decreasing flow