Melasma Overview. Patches of melasma are darker than other areas of skin because they have more pigment. The cells that produce pigment in the skin are called melanocytes. Ultraviolet radiation, or UV rays, from the sun stimulate melanocytes to produce pigment.
The human testicle .The two muscles that regulate the temperature of the testes are the dartos andcremaster muscles:â¢ Dartos Muscle The dartos muscle is a layer of smooth muscle fibers in the subcutaneous tissue of thescrotum (surrounding the scrotum).
The hypothalamus of the brain works as the thermostat for temperature control inside the body. Throughout your body are temperature receptors that send feedback to the hypothalamus.If the hypothalamus receives indication that the body is either too hot or too cold, the brain will signal the body to react.For example, if you are outside on a hot day, temperature receptors on your skin will signal the heat to your hypothalamus which responds accordingly.hermoregulation. The body regulates its temperature by means of convection, conduction and evaporation. Convection is the change in temperature due to the movement of air or water over the skin, for example, a breeze while you are running.