Hormones

Question 1

What are hormones secreted in response to? (With examples)

Answer 1

In response to a stimulus:
- neuronal stimulus
- change in ion or nutrient level
- change in the level of another hormone

Question 2

What are hormones transported throughout the body by?

Answer 2

Blood (or lymph)

Question 3

What do hormones bind to?

Answer 3

Specific receptors

Question 4

Negative feedback loop in control of hormones

Answer 4

Common. Further secretion of a hormone is stopped in response to adequate levels of that hormone

Question 5

Positive feedback loop in control of hormones

Answer 5

Rare. Release of additional hormone occurs in response to the original hormone release

Question 6

What are the two major groups of hormone classes? (based on chemical structure)

Answer 6

Aminos acid derivatives are water soluble: amines, peptides and proteins.

Lipid derivatives are lipid-soluble: steroid hormones

Question 7

Responses induced by hormones

Answer 7

• Opening or closing ion channels
• Activating or inactivating enzymes
• Promoting or inhibiting secretion of intracellular products
• Increasing or decreasing gene expression (i.e. altering transcription)
• Stimulating or inhibiting cell division