BIOL 141 Lecture Notes - Lecture 1: Texas State Highway Loop 1, Negative Feedback, Atomic Number
Document Summary
1/14/15: major theme of physiology = homeostasis, homeostasis: body"s ability to maintain a constant environment, body can detect change and respond, body has certain set points c. i. Ex: body temperature ~ 37 degrees celsius: two main types of control systems" in the body d. i. Negative & positive feedback loops = series of reactions involving molecules, cells, and tissues d. ii. Body senses a change integrate info about that change, and cause a reaction to stop or reverse the condition d. ii. 2. d. ii. 3. Physiological factor with set point receptors sense change brain integrates info and decides how to respond, a system responds and negates factor d. iii. Self-amplifying cycle in which an initial change leads to a greater change d. iii. 2. d. iii. 3. Used to cause rapid change in the body. Starts as a tiny change and gets amplified, leads to a greater change d. iii. 4. Ex: labor/child birth: pressure of a baby"s head on the cervix promotes strong contractions until the baby is born.
