The roles of membranes

Question 1

What are the roles of plasma membranes?

Answer 1

Compartmentalisation, site of cellular reactions, and acts as cell receptors + recognition

Question 2

What is cell signalling?

Answer 2

Communication using messenger molecules

Question 3

Explain the cell signalling process:

Answer 3

1. Ligand released - E.g. adrenaline
2. Travel - E.g. blood
3. Binding to receptor specific to ligand - E.g. target cell (heart)
4. Cascade of changes triggered - E.g. muscles beat faster

Question 4

What happens if theres no receptor?

Answer 4

Theres no signalling