How Does Efferent Nerve Impulses Cause Homeostasis

is activated by the rise in blood temperature and is responsible for for controlling the mechanisms that will decrease the blood temperature. Efferent nerve impulses are sent from the hypothalamus to multiple different corrective mechanisms to try to decrease the blood temperature and maintain it at approximately 37℃. The efferent nerve impulses causes the smooth muscles to relax and as a result, opens up blood capillaries near the surface of the skin. This is known as vasodilation as the blood vessels dilate and allows the heat from the core of the body to be carried out to the surface of skin and the heat can be radiated away. It is the low concentrations of adrenaline released from the adrenal medulla which stimulates receptors on the blood vessels in the skin causing them to dilate. Sweat
This is due to sweat being evaporated off the skin, removing heat with it and therefore cooling the skin. Nerve impulses also cause the erector pili muscles to relax at the base of skin hair. This causes the hairs on the cyclists arms or legs to be lowered, allowing less air to be trapped between the skin and the hair. When the cyclists are getting too hot the hypothalamus would also secrete the thyroid inhibiting hormone which stops the stimulation. This means that the anterior pituitary gland isn’t able to produce a thyroid stimulating hormone, which then causes no thyroxine to be produced. When there is no thyroid stimulating hormone produce, thyroxine can’t be secreted into the bloodstream. Therefore there is a decreased metabolic rate which results to a decrease in blood temperature. The hypothalamus would also stop stimulating to the adrenal glands and so no adrenaline is produced. This causes there to be a decrease in metabolic rate of cells and therefore there is a decrease in blood temperature too. There is also a behavioural mechanism in response to an increase of the core