EXERCISE 1 PHYSICAL PROCESSES IN CELLULAR HOMEOSTASIS.pdf

Question 1

Solubility of substances can be influenced by __________

Answer 1

its molecular structure or weight, temperature of the solvent among others

Question 2

on the other hand employs the principle that not all materials will be allowed to pass through a membrane

Answer 2

Filtration

Question 3

is the random movement of molecules, which is due to the kinetic energy of the molecules themselves

Answer 3

Diffusion

Question 4

allows molecules and ions to be equally distributed within a compartment (e.g. plasma)

Answer 4

Diffusion

Question 5

particles occurs when there is a difference in concentration between two regions of a system.

Answer 5

net diffusion

Question 6

will then take place from the region of higher concentration to the region of lower concentration

Answer 6

net diffusion of particles

Question 7

diffusion will continue until equilibrium is reached

Answer 7

diffusiontrue

Question 8

there are various factors that influence the rate of diffusion and these are conveniently grouped together in what is known as

Answer 8

Fick’s Law of Diffusion

Question 9

Fick’s Law of Diffusion

Answer 9

Q = DA (C1 - C2)

Question 10

Fick’s Law of Diffusion
Q

Answer 10

diffusion rate in moles or grams per unit time

Question 11

Fick’s Law of Diffusion
D

Answer 11

diffusion coefficient

Question 12

a composite constant that takes into account the temperature, the molecular weight of the diffusing substance, and the nature of the substance through which the first substance is diffusing

Answer 12

diffusion coefficient

Question 13

Fick’s Law of Diffusion
A

Answer 13

cross-sectional area of the plane

Question 14

Fick’s Law of Diffusion
C1 - C2

Answer 14

concentration gradient across the plane

Question 15

occurs whenever as higher concentration of solute is separated from a lower concentration of solute by a membrane that is either semi-permeable or selectively permeable

Answer 15

osmosis

Question 16

this situation, water molecules begin moving through the membrane into the region of higher solute concentration. This net movement of water is defined as

Answer 16

osmosis

Question 17

the force of the water movement across the membrane is called the

Answer 17

osmotic pressure

Question 18

The amount of osmotic pressure developed depends on the ___________ present on either side of the membrane;

Answer 18

number of particles

Question 19

the more particles there are, the ____________ the osmotic pressure

Answer 19

higher

Question 20

Osmotic pressure may be calculated using the following formula:

Answer 20

π = iRT (C1 - C2)

Question 21

π = iRT (C1 - C2)

osmotic pressure in atmospheres

Answer 21

π

Question 22

π = iRT (C1 - C2)

number of ions dissociated from each molecule in solution

Answer 22

i

Question 23

π = iRT (C1 - C2)

gas constant

Answer 23

R = 0.082 L-atm/deg-M

Question 24

π = iRT (C1 - C2)

absolute temperature Kelvin

Answer 24

T

Question 25

π = iRT (C1 - C2) concentration gradient in moles per liter

Answer 25

C1 - C2

Question 26

One mole of an _________ can produce more osmotic pressure than can one mole of a non-electrolyte

Answer 26

electrolyte

Question 27

___________ will dissociate into two or more ions in solution, each of which acts as an osmotically active particle. produce more osmotic pressure

Answer 27

electrolyte

Question 28

to compare the osmotic ability of various solutions,

Answer 28

osmolar unit of concentration