Learning Intention 2 Flashcards
To know: - how to describe a biological feedback system - conduct a valid experiment demonstrating the effect of a feedback system - to understand that multicellular organisms depend on the coordinated function of internal systems to achieve homeostasis
1
Q
What is negative feedback
A
when the body’s response acts against the stimulus, for example pulling your hand away from a hot stove
2
Q
What is positive feedback
A
when the body amplifies the stimulus and encourages change in the internal environment, for example labour
3
Q
Example of positive feedback
A
- uterus contracts
- baby moves through birth canal
- stretch receptors activate
- brain releases oxytocin
4
Q
Example of negative feedback
A
- heat from stove activates sensory
receptors in your skin - receptors send a signal through sensory
neurons to the spinal cord - spinal cord quickly processes information eithou waiting for the brain and sends a message
the effectors (hand muscles) pull your hand away
5
Q
What is homeostasis
A
a state of balance among all body systems needed to survive and function correctly
