Hormones mode of action

Question 1

What are the 3 modes of hormone action?

Answer 1

1. Pathways involving intracellular hormone receptors.
2. Activation of specific intracellular proteins via secondary messages.
3. Alteration of membrane transport mechanism.

Question 2

Provide a brief description of mechanism A (Pathways involving intracellular hormone receptors)

Answer 2

• Directly alter nuclear activity.
• To initiate or suppress biosynthesis of a specific protein.

Question 3

Provide a brief description of mechanism B (Activation of specific intracellular proteins via secondary messages)

Answer 3

• Involves cell membrane hormone receptors.
• Rather than intracellular hormone receptors.

Question 4

Provide a brief description of mechanism C and outline how it works (Alteration of membrane transport mechanis)

Answer 4

• Involves cell membrane hormone receptors to alter membrane permeability.
• After binding to a membrane receptor, hormones activate carrier molecules within the membrane.
• This increased the movement of substances from outside to inside the cell.
• Therefore affecting cell function.