HLSC 1201U Study Guide - Midterm Guide: Growth Hormone, Pituitary Gland, Circadian Rhythm
Document Summary
Part one: the endocrine system: functions of the endocrine system. Releases hormones into systemic circulation that affect specific target cells. Duration is longer (minutes hours days: hypothalamus - major regulator of homeostasis. Regulate circadian rhythms and states of consciousness. Regulates nervous system for short term response and endocrine system for long term response: types of hormones. Water soluble (amino acid based) hormones: lipid soluble hormones. Slows rate of loss in urine, provides a ready reserve of hormones in the blood. Changes gene expression in order to cause protein synthesis: water soluble hormones. Binds to a receptor outside the cell and activates something inside the cell to cause a response: action of hormones. Or opposite: influence on hormonal activity. More receptors = more hormones = increased effect some neurotransmitters have tighter fit with receptors, and same with hormones and their receptors. Permissive effect: one hormone will allow a second to function (epinephrine needs thyroid hormones to strongly stimulate lipolysis)
