Explain how negative feedback and hypothalamic coordination maintain human core temperature near 37 °C through sweating, shivering and skin blood-flow changes.
Describe how body temperature is maintained in humans.
a. maintained close to 36.7/37∘C/98.6∘F;
b. heat is transferred/distributed in body by blood;
c. hypothalamus contains thermoreceptors;
d. hypothalamus monitors temperature/sends message to effectors/causes response;
e. (vaso) dilation of skin arterioles warms skin/cools body;
f. (vaso) constriction of skin arterioles retains body heat;
g. skin/sweat glands produce sweat to cool the body when overheated;
h. removal of heat through evaporation of sweat;
i. shivering generates heat / increased metabolism / hair erection to retain heat;
j. example of behavioural change to warm/cool the body to thermoregulate;