LS4004 Human Physiology - Homeostatsis

Biological Set Points [2]

body temperature (36.1 - 37.2oC)

fasting blood glucose (4-7mmol/L)

What is negative feedback?

A response to a change in the body that counteracts or opposes the initial change.

What is the communication between the Receptors and the integrating centre?

afferent pathway

What is the communication between the integrating centre and the effectors?

efferent pathway

What is positive feedback?

Body ENHANCES original stimulus to make deviation greater

Positive Feedback loop, cutoff examples for Pregnancy and the Ovary

Preganancy: Baby is born and stops pressuing on the cervix

Ovary: ovulation stops as the follicle gets bigger then bursts

Positive Feedback in Pregnancy

- Baby pushes against uterus causing cervix to stretch
-Streching of the cervix sends nerves to brain
-The Brain stimukates the pituary to release oxytosis
-oxytocin causes the uterus to conatct
- Baby pushes against uterus causing cervix to stretch