Most enzymes are

A. Glucose: Glucose is the immediate form of sugar circulating in the blood and used by cells for energy. However, it is not stored in large amounts inside the liver or skeletal muscles, as excess glucose must be converted into a storage form.

B. Cholesterol: Cholesterol is a lipid molecule involved in cell membrane structure and hormone synthesis. It is not a storage form of carbohydrates and is handled differently in the body compared to sugars and glycogen.

C. Triglycerides: Triglycerides are the main storage form of fats found in adipose tissue. They serve as long-term energy reserves but are not the form in which carbohydrates are stored in the liver or muscles.

D. Glycogen: Glycogen is the storage form of carbohydrates in the body, primarily stored in the liver and skeletal muscle. It serves as a readily available energy reserve that can be broken down to glucose when blood sugar drops or energy demands increase.

A. Polar solvent properties: Water’s polarity makes it an excellent solvent for ionic and polar substances, allowing chemical reactions to occur in the body. While this property is critical for metabolism, it is not related to the cooling effect of sweating.

B. Cushioning: Water provides cushioning by forming protective fluids such as cerebrospinal fluid and amniotic fluid, which absorb shocks. This protective role is important, but it does not explain how sweating helps regulate temperature.

C. Reactivity: Water participates in many chemical reactions, such as hydrolysis and dehydration synthesis. Although essential for metabolism, reactivity does not contribute to the cooling mechanism of sweating.

D. High heat capacity: Water resists temperature changes by absorbing or releasing large amounts of heat with minimal changes in its own temperature. This helps stabilize body temperature, but sweating specifically relies on a different property.

E. High heat of vaporization: Sweating demonstrates water’s high heat of vaporization, meaning it requires a significant amount of heat energy to change from liquid to vapor. As sweat evaporates from the skin, it absorbs body heat, producing a cooling effect.