Homeostasis Flashcards
1
Q
role of homeostasis
A
regulate physiological variable relative to a set point
2
Q
negative feedback
A
returns to set point
3
Q
neg feedback examples (3)
A
body temp: use heating (decreased blood flow to skin, shivering) and cooling ( increased blood flow to skin, sweating, panting) physiology
hypothalamus: hyp produces TRH, pit produces TSH, thyroid makes T3 and T4. iodine is related to t3 and t4
Endocrine: Ca low, parathyroid secretes PTH releasing ca from bone. Ca high, parathyroid inhibited
4
Q
pos feedback examples (2)
A
childbirth: oxytocin- increases contraction- feeds to pit- more oxytocin produced
nerve AP
5
Q
positive feedback
A
away from set point
6
Q
Feed forward
A
physiology adjusted in advance
7
Q
feedforward example
A
racehorse increasing breathing when walking to start gate
