Group 1: Irene, Eva, Mike, Karen, Karry

When the head of fetus pushes against cervix, the nerve impulses from cervix is transmitted to the brain. Then, the brain stimulated pituitary gland to secrete oxytocin. Oxytocin carried in bloodstream to uterus. Oxytocin stimulates uterine contractions and pushes fetus toward cervix

negative feedback:

reverse the initial change to normal level when sensing sth is high for example your body temperature, or hormones. In child birth case, if the mechanism of negative feedback is working, it would be even harder to push the baby out from the uterus

• In the cold room 

• body temperature decreases 

• The thermoreceptor present in the skin is stimulated by the low temperature 

• Send the nerve impulse to thermoregular centre of  the hypothalamus 

•  Hypothalamus send the nerve impulse to the effectors

• Effectors is stimulated To give response 

• Heat loss decreases and heat gain increases 

• Body temperature raise back to normal range 

Difference:

N: Back to original point

P:Amplifies the process

E.g. Body temperature control, Blood glucose levels VS Child Birth

P : Leading to increased activity or effects

N : promoting stability and balance in a system