BIOA02H3 Lecture 15: Lec15 - The Endocrine System.doc

• School: UTSC
• Department: Biological Sciences
• Course: BIOA02H3
• Professor: Mary Olaveson

Document Summary

2 adrenal gland: nervous system, neural networks / rapid signalling, endocrine system, endocrine glands secrete hormones that mediate slower, but longer- lasting responses, endocrine system functions more as a regulatory than a command system. Secretes hormones that move through blood or extracellular fluid: response can be very rapid (e. g. adrenalin, or very slow (e. g. changes in protein synthesis or gene transcription, adrenal gland has two parts, outer cortex. Releases adrenaline: part of fight or flight response, the more cortisol you have, the more rapidly you age. Hormones acts on target tissues: hypothalamus has neurons which produces two hormones, adh, oxytocin, the axons from these cells are found on the nerve terminals (posterior pituitary) 5 paracrine and autocrine signaling: paracrine endocrine signalling, an endocrine releases hormones, hormones don"t travel through the blood. Released and travels to target cell via extracellular fluid: e. g. dopamine (autocrine manner)