CH 20 Vessels part 3

Question 1

What is venous pooling?

Answer 1

Blood not returning to the heart

Question 2

What causes venous pooling?

Answer 2

Blood clumping

Question 3

What factors determine blood resistance?***

Answer 3

1. Viscosity
2. Vessel length
3. Vessel size

Question 4

Does slower blood flow increase or decrease blood pressure?

Answer 4

Increase

Question 5

What two things about blood are directly related?***

Answer 5

Blood resistance and pressure

Question 6

What is resistance?***

Answer 6

The friction blood encounters

Question 7

What is the fastest way the body regulates blood resistance is by altering the?

Answer 7

Vessel radius

Question 8

Where is the vasomotor center located?

Answer 8

Medulla oblongata

Question 9

Vasomotor center function?

Answer 9

Influence blood pressure by changing vessel diameter

Question 10

What ANS division controls the vasomotor center?***

Answer 10

Sympathetic

Question 11

Do we have more a1 or b1 receptors in the body?***

Answer 11

a1

Question 12

a1 receptor function?

Answer 12

Increase blood pressure and resistance

Question 13

What is the relationship between Symp. and blood pressure?

What is one mechanism on which stimulation through Symp. affects overall blood pressure?

Answer 13

1. Sympathetic causes blood pressure to increase.

2. When arteries vasoconstrict resistance and blood pressure increases

Question 14

What do baroreceptors respond to?

Answer 14

Stretching of the vessel wall

Question 15

What are autonomic reflexes initiated by?

Answer 15

Increase or decrease in blood pressure

Question 16

What stimulate chemoreceptors?

Answer 16

1. High CO2
2. Low Ph
3. Very low O2 levels

Question 17

Why do veins vasoconstrict when bleeding?

Answer 17

Because there is less stretch detected on veins

Question 18

a1 receptors are mainly vasoconstriction or vasodilation?

Answer 18

Vasoconstriction

Question 19

b1 receptors are mainly vasoconstriction or vasodilation?

Answer 19

Vasodilation