Exercise causes: (AIIMS NOV 2012)
|A||Increased blood flow to the skin|
|B||Increased in cerebral blood flow due to increase in systolic blood pressure|
|C||Body temperature rise|
|D||All of the above|
a. During exercise the body temperature rises, and the hypothalamic centers that control heat dissipating mechanisms are activated.
b. The temperature increase is due in part to the inability of the heat dissipating mechanism to handle the great increases in heat production, but there is evidence that during exercise there is in addition a resetting of the thermostat ie an increase in the body temperature at which the heat dissipating mechanisms are activated sweat seceactin is greatly increased and vaporization of this sweat is the major path for heat loss. The cutaneous vessels also dilate.
c. The dilation is primarily due to inhibition of vasoconstrictor tone, although local release of vasodilator polypeptides may also contribute.