L10: Capillaries

Question 1

What does the rate of diffusion depend on

Answer 1

Concentration gradient
Surface area
Diffusion distance

Question 2

What happens to the rate of diffusion as the concentration gradient increases

Answer 2

Increases

Question 3

What happens to the rate of diffusion as surface area increases

Answer 3

Rate increases

Question 4

What happens to the rate of diffusion as diffusion distance increases

Answer 4

Decreases

Question 5

What is the surface area determined by

Answer 5

Number of capillaries

Question 6

How do we maximise a concentration gradient

Answer 6

By maintaining a good blood flow

Question 7

What happens to the diffusion distance when there is tissue oedema

Answer 7

Diffusion distance increases therefore diffusion rate decreases

Question 8

What is anaemia

Answer 8

When there is a low haemoglobin count in the blood

Question 9

What happens to the diffusion distance when there is anaemia

Answer 9

Diffusion distance increases and therefore the rate of diffusion decreases

Question 10

What is atherosclerosis

Answer 10

When the elastic arteries stiffen as you age so the blood flow decreases

Question 11

What is a capillary hydrostatic pressure

Answer 11

The pressure that causes the blood to filter into the interstitial space

Question 12

In an healthy individual do we have an intersitial oncotic pressure

Answer 12

No because the would be no proteins in the intersitial space so it would be 0

Question 13

What are the forces favouring reabsorption of fluid into the capillaries

Answer 13

Intersitial hydrostatic pressure

Capillary oncotic pressure

Question 14

In a normal healthy individual what would the intersitial hydostatic pressure be

Answer 14

0

Question 15

What is the capillary oncotic pressure caused by

Answer 15

Proteins in the capillaries which draws water from the interstitial space

Question 16

Overall in a healthy individual what are the only 2 forces found in the capillaries

Answer 16

Capillary hydrostatic pressure

Capillary oncotic pressure

Question 17

What does the area above the oncotic pressure represent

Answer 17

Filtration

Question 18

What does the are below the oncotic pressure represent

Answer 18

Reabsorption

Question 19

In a healthy individual what is the hydrostatic pressure at the arteriolar end

Answer 19

35

Question 20

In a healthy individual what is the capillary hydrostatic pressure at the venule end

Answer 20

15

Question 21

What is the normal capillary hydrostatic pressure

Answer 21

15 mmHg

Question 22

What happens to the capillary hydrostatic pressure when there is arterial vasodilation

Answer 22

Increases

Question 23

What happens to the oncotic pressure when there is a arterial vasodilation

Answer 23

Stays the same at 25 mmhg

Question 24

What happens to the capillary hydrostatic pressure when there is a arterial vasoconstriction

Answer 24

Hydrostatic pressure decreases

Question 25

What happens to the capillary oncotic pressure when there is arterial vasoconstriction

Answer 25

Stays the same at 15 mmHg

Question 26

What happens to the capillary hydrostatic pressure when there is a increased capillary pressure

Answer 26

Increases

Question 27

What happens to the capillary oncotic pressure when there is an increased capillary pressure

Answer 27

Stays the same at 25mmhg

Question 28

What happens to the capillary hydrostatic pressure when there is a high venous pressure

Answer 28

The arteriolar end pressure stays the same at 35 mmhg the capillary hydrostatic pressure will increase from 15mmg in the venous side

Question 29

What would happen to the oncotic pressure when there is an increased venous pressure

Answer 29

Stays the same at 25 mmhg

Question 30

What happens to the net oncotic pressure when there is increased interstitial protein

Answer 30

Decreases because net oncotic pressure= capillary oncotic pressure- intersitial oncotic pressure

Question 31

What happens to the hydrostatic pressure when there is an increased intersitial protein

Answer 31

Stays the same from 35 to 15 mmhg

Question 32

What happens to the net oncotic pressure when there is plasma protein deficiency

Answer 32

Decreases

Question 33

What happens to the hydrostatic pressure when there is a plasma protein deficiency

Answer 33

Stays the same

Question 34

What happens to the oncotic pressure in dehydration

Answer 34

Increases

Question 35

Why does the oncotic pressure increase in dehydration

Answer 35

You have the same amount of protein in the blood but it is in a less volume so there is higher concentration of protein

Question 36

What happens to the hydrostatic pressure in dehydration

Answer 36

Decreases