Practical Two

Question 1

Interstitial fluid

Answer 1

water + dissolved substances eg vitamins

Question 2

Active transport

Answer 2

cell uses energy to move substances across membrane eg NA/K ions

Question 3

What are the three components of blood?

Answer 3

• Plasma 55%
• Buffycoat < 1%
• Erythrocytes 45%

Question 4

What makes up plasma?

Answer 4

• water
• WBC
  (least dense)

Question 5

What makes up Buffycoat ?

Answer 5

• leukocytes

- platlets

Question 6

What makes up Erthyrocytes ?

Answer 6

• RBC

most dense

Question 7

Which layer of blood is haematocrit ?

Answer 7

erthrocytes

Question 8

haemotcrit

Answer 8

anemic (oxygen deprivation)

Question 9

haemotacrit

Answer 9

polysethemia

Question 10

function of RBC in gas transport

Answer 10

combining oxygen gas with haemoglobin

Question 11

What strucure is absent in RBC

Answer 11

a nucleus = increased surface area= haemoglobin to carry oxygen

Question 12

what is the sape of a RBC and how does it facilitate transport

Answer 12

• Bioconcave discs = increased surface area = increased haemoglobin transported
• also allows to pass through small capillaries

Question 13

diffusion

Answer 13

tendency of molecules/ions to move from an area of high concentration down a concentration gradient

Question 14

Osmosis

Answer 14

Diffusion of a solvent (water) through a selectively permeable membrane passing through membrane when there is a different concentration on either sides

Question 15

Tonicity

Answer 15

ability of a solution to cause a change in cell shape or tone by osmosis

Question 16

Isotonic

Answer 16

Solution with a concentration of nonpenetrating solutes equal to that found in reference cell

Question 17

Hypotonic

Answer 17

below normal tone or tension

more dilute than reference cell

Question 18

Hypertonic

Answer 18

High concentration of non penetrating solutes than reference cell
greater osmotic pressure

Question 19

how does RBC in an isotonic solution affect osmosis

Answer 19

no net water movement across cell membrane

Question 20

how does RBC in hypotonic solution affect osmosis

Answer 20

net water movement into cell resulting lysis

Question 21

what does a greater concentration gradient mean

Answer 21

the faster molecules will move

therefore faster in a 3% solution