ANP 1105 Midterm: Homeostasis (All you need to know for midterms)

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1105
• Professor: Joanne Savory

Document Summary

Internal mechanism for the body to maintain an environment in which cell can survive. [3. 1. 1] deine & idenify the principal characterisics of homeostasis. A system in which variables are regulated, so that internal condiions remain stable and relaively constant: *homeostasis is a dynamic state of equilibrium, involving many systems: adequate blood levels of vital nutrients, heart acivity/blood pressure monitored & adjusted as needed, wastes must not accumulate, body temperature. [3. 1. 2/3] 3 essenial components of a homeostaic control mechanism. Receptor: senses change (simulus) & send info (aferent pathway) to the control centre. Control centre: determines set point for variable maintenance; analyzes info and determines correct response. Efector: provides means for response (output along eferent pathway) *feedback: +ve/-ve feedback allows for regulaion within a range/enhanced response. Negaive feedback mechanisms output reduces/shut of simulus: 1 hormone regulaing a process: -ve feedback decreases secreion, process regulated in opposide direcions by 2 diferent hormones e. g. blood glucose level: