BIOL 2P05 Lecture Notes - Cytoplasm, Adipose Tissue, Mitosis
13 Jan 2013
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Document Summary
Excess/rise in core body temp by increasing heat. Receptors in hypothalamus detect increase in core temp/temp of blood. Arterioles leading to capillaries in the skin dilate (expand) More blood flows to skin surface (capillaries) / heat loss by radiation. Heat loss by evaporation of sweat / by using energy: high(er) rate of sweating leads to a low(er) skin temp. Voluntary centre: remove clothing / seek cooler area / cold drink. The role of temperature receptors in the skin. Hypothalamus detects temp fluctuation inside the body/internal environment. Skin receptors detect temp changes in external environment. Information is sent by nerves to voluntary centres of the brain: voluntary activities (jogging, moving into a shade) are initiated, changes behaviour of human. The structure and role of the skin in temp regulation. Surface area is very large and in direct contact to external environment. Skin is divided into two layers: outer epidermis and inner dermis.
