Role of membrane receptors

Question 1

Contact Signaling Receptors occur when

Answer 1

cells come into contact with
each other.
- This is important in normal development and immunity.
- For example, the histocompatibility markers used in organ transplants

Question 2

Which signaling represents the most common group?

Answer 2

chemical signaling

Question 3

• Different cells can respond differently to the same ligand
• For example, the neurotransmitter,norepinephrine contracts the
  smooth muscle in the arteries and dilates the smooth muscle in the
  bronchi. How is this accomplished?

Answer 3

being coupled to a regulatory molecule called the G
protein being coupled to the membrane receptor