Negative and Positive Effects on Stimulus

Negative Feedback Mechanisms:
Effector acts to ______ the initial stimulus

reduce/ reverse
Ex. Blood Sugar
eat 4 donuts -> blood sugar ____ ->
____ released ->
blood sugar ______ as well as the _____ level
- goes up
- insulin
- goes down
- insulin
Ex. Blood Pressure
Blood Pressure low -> anti diuretic hormone increases -> go to the bathroom less -> retain water-> blood level goes up -> blood pressure goes up -> ADH goes up
Most homeostatic control mechanisms are _____ feedback mechanisms which control ______, ______, _____, _____, _____, _____
negative
- heart rate
- blood pressure
- blood oxygen levels
- carbon dioxide levels
- mineral levels
- breathing rate
Positive Feedback Mechanisms:
Effector acts to ___ the initial stimulus.

increase
Ex. Blood Clotting
tear/break in blood vessel, exposes ______ -> ______ stick to these -> they release a chemical that attracts more of them to the damaged area -> the pileup and chemical release leads to _____
- collagen fibers
- platelets
- clot
Ex. Birthing Process
Baby's head pushes on the _____ -> stimulating pressure _____ -> causes brain to release ______ -> stimulates muscles of ______ to contract -> pressure on the ______ increases -> _____ levels go up -> frequencies of contractions go up, etc. -> baby is born
- cervix
- receptors
- oxytocin
- uterus
- cervix
- oxytocin
When the body is not able to maintain homeostasis.

Homeostatic Imbalance

Author

Anonymous

61690

Card Set

Negative and Positive Effects on Stimulus

Description

The results of the response then feed back to effect the stimulus, either reducing it (negative feedback) or enhancing it (positive feedback)

Updated

2011-01-24T22:12:16Z

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