ANP 1105 Lecture Notes - Lecture 12: Homeostasis, Adrenal Medulla, Biofeedback

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1105
• Professor: William Staines

Document Summary

A system in which variables are regulated so that internal conditions remain stable and relatively constant: temperature regulation (sweat/shiver, blood ion concentration control. A dynamic state of equilibrium involving many systems. Receptor: senses change & sends info (afferent pathway to cc) Control center: determines set point for variable maintenance; analyzes info & determines correct response. Feedback: allows for regulation within a range/enhanced response. Response of mechanism enhances original stimulus output is further. Change occurs in same direction as original response. Goal to be attained: example; blood clotting. System of motor neurons to smooth, cardiac muscle, and glands to allow responses usually without our awareness. Somatic: thick, myelinated axon from spinal cord to skeletal muscle. Ans: two neuron chain that originates in the brain or spinal cord. Preganglionic axons are thin and lightly myelinated. Keeps body"s energy use low while regulating activities. Regulation: adrenal medulla, sweat glands, arrector pili muscles of skin, kidneys, most blood vessels.