Metabolism:
* Liver: The liver is the central metabolic organ. It plays a crucial role in:
* Carbohydrate metabolism: Converting glucose to glycogen for storage, releasing glucose into the bloodstream, and participating in gluconeogenesis (creating glucose from non-carbohydrate sources).
* Lipid metabolism: Synthesizing and breaking down fats, producing cholesterol, and processing lipoproteins.
* Protein metabolism: Synthesizing and breaking down proteins, producing amino acids, and detoxifying ammonia.
* Detoxification: Breaking down and eliminating toxins and drugs from the body.
* Pancreas: The pancreas secretes hormones (insulin and glucagon) that regulate blood sugar levels.
* Insulin: Lowers blood sugar by promoting glucose uptake by cells.
* Glucagon: Raises blood sugar by stimulating the liver to release stored glycogen.
* Thyroid gland: Produces thyroid hormones (T3 and T4), which regulate metabolism and affect growth and development.
* Adrenal glands: Secrete hormones (cortisol and adrenaline) that influence metabolism, stress response, and blood pressure.
Temperature Regulation:
* Hypothalamus: This part of the brain acts as the body's thermostat, controlling and regulating body temperature. It receives input from sensors throughout the body and initiates physiological responses to maintain a stable core temperature.
* Skin: The skin acts as a barrier to heat loss and plays a key role in thermoregulation through:
* Sweating: Evaporation of sweat cools the body.
* Vasodilation/vasoconstriction: Blood vessels in the skin dilate (expand) to release heat and constrict (narrow) to conserve heat.
* Muscles: Shivering generates heat, a mechanism to warm the body.
* Circulatory system: The heart and blood vessels work together to transport blood throughout the body, distributing heat and carrying away metabolic byproducts.
It's important to note that these organs work in a complex and interconnected manner to maintain metabolic balance and a stable internal temperature. They are constantly responding to internal and external cues, adjusting their activities to meet the body's needs.
