L2 Cell To Cell Communication

Question 1

How do cells sense changes

Answer 1

Through receptors

Question 2

What happens when a receptor receives info

Answer 2

Generates an intracellular signal

Question 3

What are receptors

Answer 3

Proteins
Activated by stimulus
Sensitive to external and internal environmental change

Question 4

Give some example of sensory receptors

Answer 4

Baroreceptors
thermoreceptors
Photoreceptors

Question 5

What type of impulse do they respond to
Give examples

Answer 5

Electrical impulse
Voltage gated ion channel

Chemical
Ligand gated ion channel

Question 6

What is meant by endogenous ligands

Answer 6

Produced by the body itself

Question 7

Example of endogenous ligand

Answer 7

Insulin acting on insulin receptors

Question 8

What are exogenous ligands

Answer 8

Synthesised

Question 9

Example of exogenous ligands

Answer 9

Artificial drugs
Or
Extracted from animals / plants

Question 10

4 type of receptors

Answer 10

Ligand gated receptors
Enzyme linked receptors
G protein receptors
Intracellular protein

Question 11

Ligand

Answer 11

Chemical that binds to receptors

Question 12

Time scale of ligand gated ion channels

Answer 12

Milliseconds

Question 13

What happens when a ligand buns to a ligand gated ion channel

Answer 13

Change in membrane potential

Question 14

What happens when a ligand binds to a G protein receptor

Answer 14

Change in excitability

Question 15

Time scale of G protein receptors

Answer 15

Seconds

Question 16

What happens when a ligand binds to a enzyme linked receptor

Answer 16

Phosphorylation