Endocrine System

Question 1

What is an endocrine system

Answer 1

A system of glands that produces hormones

Question 2

What are hormones

Answer 2

Chemicals that are secreted into the bloodstream to regulate growth, metabolism and sexual development

Question 3

What is the difference between endocrine and paracrine??

Answer 3

Endocrine is in the bloodstream while paracrine only has local effects

Question 4

What are the 3 chemical classes of hormones?

Answer 4

1. Derivatives of Amino Acids (f.ex tyrosine and tryptophan)
   Catecholamines (Adrenal Medulla)
   Thyroxine (T4) (Thyroid)
2. Peptide hormones (chains of amino acids)
   Peptide (smaller) hormones:
   Thyrotrophin releasing hormone (TRH, hypothalamus)
   Antidiuretic hormone (ADH; hypothalamus -stored in the posterior “neuro” pituitary)
   Protein (larger) hormones:
   Insulin
   Growth Hormone (GH)
3. Steroid hormones (from cholesterol)
   Sex hormones
   Cortisol