Endocrine system

Question 1

What are the general features of endocrine systems?

Answer 1

• Secrete hormone directly into blood (apart from thyroid)
• Diverse embryological origins
• Ductless glands
• Role is communication

Question 2

What are the types of endocrine system?

Answer 2

1. Primary purpose endocrine e.g. discrete organs, pituitary, thyroid, parathyroid, adrenal, pineal
2. Endocrine combined with other functions e.g. pancreas, testes, ovaries, placenta
3. Secondary endocrine function e.g. liver, kidney, thymus, heart, GIT

Question 3

What are the 4 classes of hormones?

Answer 3

1. Peptide e.g. oxytocin, vasopressin
2. Amine e.g. dopamine, melatonin, adrenaline
3. Steroid e.g. oestradiol, cortisol, aldosterone
4. Protein e.g. GH, insulin, ACTH

Question 4

How is hormone release regulated?

Answer 4

Overall is regulated by homeostasis

1. Hormonal - pituitary releasing hormones e.g. FSH
2. Neural - adrenal medulla
3. Humoral - BP and kidneys JG apparatus, physical change that causes release of hormone