Overview Of Circulation

Question 1

What are platelets formed from?

Answer 1

Macrokaryocytes

Question 2

What pH is the blood kept at?

Answer 2

~7.4

If it drops below 6.8 or goes above 8.0, the cells will die

Question 3

How does acidosis kill cells?

Answer 3

It denatures metabolic enzymes and ion channels

-Decreased CNS function can lead to coma or death

Question 4

How does alkalosis lead to cell death?

Answer 4

• The neurons become hyper excitable, which leads to tingling, fasciculation, paralysis of respiratory muscles

Question 5

Most myocardial perfusion occurs during what?

Answer 5

Heart relaxation (diastole)

Question 6

Which type of vessel contains the most elastic fibers? Why is this beneficial?

Answer 6

Arteries contain the most elastic fibers and this is beneficial because it allowed for distention and recoil

Question 7

Which vessel contains the most collagen? Why is this beneficial?

Answer 7

Veins have the most collagen. It gives structural support

Question 8

Where does the largest drop is pressure occurs in vessels?

Answer 8

The arterioles because they do not have elastic fibers

Question 9

Is pulmonary or systemic pressure higher?

Answer 9

Systemic.

Pulmonary does not have to high because the lungs are close and the blood does not have to travel as far.

Question 10

What is velocity of flow inversely relegated to?

Answer 10

Total cross sectional area

Question 11

What are conduit vessels?

Answer 11

Arteries

Question 12

What are exchange vessels?

Answer 12

Capillaries

Question 13

What are capacitance vessels?

Answer 13

Veins

Question 14

What side of the heart is the tricuspid valve on?

Answer 14

The right

Question 15

What side of the heart is the mitral valve on?

Answer 15

The left

Question 16

Why is perfusion not significant during contraction?

Answer 16

Compression of the coronary vessels

Question 17

What are the primary resistance vessels?

Answer 17

Arterioles

Question 18

What is blood flow?

Answer 18

The volume of blood flowing through a structure per unit of time

Question 19

What does resistance refer to?

Answer 19

Opposition of blood flow through a vessel

Question 20

Which vessels have the lowest pressure?

Answer 20

Veins

Question 21

What vessel does the largest pressure drop occur in?

Answer 21

Arterioles

Question 22

Does the pulmonary or systemic circuit have higher pressure? Why?

Answer 22

The systemic has higher pressure because the blood has farther to travel. In the pulmonary circuit, the blood only needs to go to the lungs

Question 23

What affects the velocity of blood flow?

Answer 23

The area of the vessels

Question 24

Where is the velocity of flow the slowest?

Answer 24

The capillaries, they have the largest cross sectional area

Question 25

Are alpha 1 receptors responsible for vasoconstriction of vasodilation?

Answer 25

Vasoconstriction

Question 26

Are Beta 2 receptors responsible for vasoconstriction of vasodilation?

Answer 26

Vasodilation

Question 27

Does blood travel through multiple capillary beds or organs during a single trip around the body?

Answer 27

No. Complex organization allows everything to get its own blood supply