Digestive and Excretory System
Science

A unit of heat used to measure the energy content of food, a calorie is the amount of heat required to raise the temperature of 1 g of water by 1°C
Calorie
A unit of heat used to measure the energy content of food, a calorie is the amount of heat required to raise the temperature of 1 g of water by 1C. A calorie is a measure of energy.

A fingerlike projection of the small intestine that increases the surface area for absorption
Villus
A fingerlike projection of the small intestine that increases the surface area for absorption. Villus. A villus is a tiny, hairlike structure in the small intestine that helps absorb nutrients from food.