Endocrine System

Question 1

Nervous system vs Endocrine System

Answer 1

 Nervous system acts quickly – uses negative and positive feedback

 Endocrine system acts slowly – uses negative feedback loop

Question 2

Steroid and Non steroid hormones

Answer 2

Steroid hormones – lipid-soluble, derived from cholesterol

 Can pass easily through cell membranes
 Example: Cortisol

Nonsteroid hormones – derived from protein, amino acids, or peptides

 Need receptors and 2nd messengers to relay message into cell
 Example: Epinephrine

Question 3

Cortisol ( hydrocortisone)

Answer 3

Functions:

 Gluconeogenesis – reverses glycolysis; ensures fuel supply (i.e. for the brain) when fasting or during vigorous exercise

 Increases vasoconstriction initiated by epinephrine

 Anti-inflammatory agent

Question 4

Epinephrine (adrenaline)

Answer 4

Increased plasma concentration from 60-70% of VO2 max

Functions:

 Increased HR
 Increased respiration
 Increased BP
 Blood to skeletal muscles
 Increased glycogenolysis