Lecture 3

Question 1

body fluid compartments

Answer 1

ICF and ECF

Question 2

ICF

Answer 2

2/3 of total body water volume

Question 3

ECF

Answer 3

1/3 of total and consists of interstitial fluid and blood plasma

Question 4

interstitial fluid

Answer 4

lies between circulatory system and cells

Question 5

blood plasma

Answer 5

liquid matrix of blood

Question 6

ECF and ICF are in…

Answer 6

osmotic equilibrium

Question 7

osmosis

Answer 7

movement of water across a membrane in response to a solute conc. gradient

Question 8

water can move freely between…

Answer 8

ICF and ECF through aquaporin channels

Question 9

how many different aquaporin channels?

Answer 9

13

Question 10

osmotic equilibrium does not equal…

Answer 10

chemical or electrical equilibrium

Question 11

osmolarity

Answer 11

describes the number of particles in solution (osmol/L)

Question 12

osmotic movement of water can be predicted by knowing…

Answer 12

the concentrations of each solution

Question 13

normal osmolarity in the human body is….

Answer 13

280-296 mOsm

Question 14

isosmotic

Answer 14

solutions have identical osmolarities

Question 15

hypersmotic

Answer 15

describes the solution with the higher osmolarity

Question 16

hyposmotic

Answer 16

describes the solution with the lower osmolarity

Question 17

tonicity

Answer 17

describes a solution and how it would affect cell volume if a cell were placed in the solution and allowed to come to equilibrium

Question 18

water moves in higher penetrating or non-penetrating?

Answer 18

non-penetrating

Question 19

simple diffusion

Answer 19

the movement of molecules from an area of high conc. to low conc.

Question 20

Diffusion uses…. energy and not…..

Answer 20

kinetic, outside energy

Question 21

diffusion continues until….

Answer 21

conc. come to equil.

Question 22

diffusion is faster…

Answer 22

• along higher conc. gradients
• over short distances
• at higher temp.
• for smaller molecules

Question 23

rate of diffusion through a membrane is faster if…

Answer 23

• larger membrane surface area
• thin membrane
• large conc. gradient
• membrane is more permeable to molecule

Question 24

membrane permeability depends on…

Answer 24

• molecule’s lipid solubility
• molecule size
• lipid composition

Question 25

Law of Diffusion

Answer 25

Fick

Question 26

channel proteins

Answer 26

made of membrane spanning protein subunits with a pore through the center; FAST

Question 27

how are channel proteins names?

Answer 27

according to substances that pass through

Question 28

open channels =

Answer 28

leak channels

Question 29

different kinds of gated channels

Answer 29

chemically, voltage, and mechanically

Question 30

carrier proteins

Answer 30

large complex proteins that slowly transport substance that cannot pass through channels by changing conformation