Week 4 - Transport of Nutrients

Question 1

Define homeostasis

Answer 1

Ability of body or cell to maintain a condition of equilibrium or stability w/in its internal env. when dealing w/ external changes

Question 2

What 3 sections are there to homeostasis

Answer 2

Receptor

Control centre

Effector

Question 3

Negative fb loop

Answer 3

Reverses the initial change, towards homeostasis

Question 4

Positive fb loop

Answer 4

Expands the initial stimulus/response towards change direction

Question 5

Functions of the cell membrane

Answer 5

Prevent entry of some substances while retaining others

Reg. transport rate of fuel into cell

Provides attachment surface for proteins

Communication between extra- + intra- cellular env.

Question 6

What are the passive methods of cell membrane transport

Answer 6

Simple diffusion

FD

Osmosis

Filtration

Question 7

What are the active methods of cell membrane transport

Answer 7

Na+/K+ pumps

Bulk transport (Endo, exo + phagocytosis)

Secondary AT

Question 8

What substances can undertake simple diffusion

Answer 8

H20

Gases (O2,CO2)

Small uncharged particles

Lipid soluble mol.

Question 9

What substances can undertake facilitated diffusion

Answer 9

Ion channels

aa

glucose

non specific transporters

Question 10

Can FD be voltage dependent

Answer 10

YES

Question 11

Carb content for hypotonic solutions

Answer 11

1-3%

Question 12

Carb content for isotonic solutions

Answer 12

6-8%

Question 13

Carb content for hypertonic solutions

Answer 13

10%+

Question 14

Purpose of hypotonic drinks

Used by who?

Answer 14

Quickly replace fluids lost by sweating

i.e gymnasts

Question 15

Purpose of isotonic drinks

Answer 15

Quickly replace fluids lost by sweat + provide a boost of CHO

Question 16

Purpose of hypertonic drinks

Answer 16

To suplement CHO intake

Question 17

Define filtration

Answer 17

Movement of H20 + solutes across membrane due to HP from CV system.

Higher bp = higher filtration