Lecture 11

Question 1

How does change in pressure affect the control of blood?

Answer 1

Low pressure = lack of control of blood and High pressure = full control of blood

Question 2

Why does mean arterial pressure maintain high in the arteries?

Answer 2

Because they need fine control over where the blood goes. Veins don’t need this because they are collecting the blood instead of controlling where it goes.

Question 3

What does in parallel mean in regards to the systemic circuit?

Answer 3

The systemic circuit pumps blood out of the heart then starts to branch, so can be thought of as many individual circuits which are in parallel, meaning they are branching some of that flow in different direction and there no longer needs to be equal flow.

Question 4

What side of the heart ejects blood into the pulmonary circuit?

Answer 4

right

Question 5

Where does blood flow from the systemic circuit go?

Answer 5

Each branch leads off to a different organ, distributing the flow of blood coming from the right side of the heart. The organs have different flow rates however the distribution still adds up to the same volume of blood that was transported into the lungs and left side of the heart

Question 6

Can the flow distribution to each organ be altered?

Answer 6

Yes in order to meet metabolic demands.

Question 7

What organs demand higher flow during exercise?

Answer 7

Skeletal muscle, heart, skin because they are contracting, beating faster and doing thermoregulation.

Question 8

Does blood flow decrease in other organs that aren’t being used during exercise

Answer 8

Yes, for example the kidneys and GI tract

Question 9

Does blood flow to the brain. change?

Answer 9

No, it remains constant in all conditions

Question 10

What is divergent flow?

Answer 10

Direct systemic circuit depending on metabolic needs

Question 11

How is MABP maintained during exercise?

Answer 11

If Cardiac output increases, total peripheral resistance must be reduced

Question 12

What are artereoles?

Answer 12

Very small vessels that connect the arteries and capillaries

Question 13

What is the normal state measurements

Answer 13

Diameter of 1 ad flow of 16/minute

Question 14

How is resistance related to flow?

Answer 14

Reducing resistance increases flow and visa versa.

Question 15

What is Vasoconstriction?

Answer 15

When smooth muscle contracts the luminal space decreases, therefore increasing resistance and decreasing flow

Question 16

What is vasodilation?

Answer 16

Smooth muscle relaxes so the luminal space increases, therefore decreasing resistance and increasing flow