What is the function of folds and villi? a. allowing particles in the small intestines to flow from the jejunum to the ileum b. expanding volume to increase gas exchange from the respiratory system to the digestive system c. increasing surface area to improve nutrient absorption between the digestive and circulatory systems d. trapping food particles that flow through the small intestines

Correct C) Increasing surface area to improve nutrient absorption between the digestive and circulatory systems

The small intestine contains a large number of small finger-like projections called villi, which increases the intestinal surface area and help in the absorption of nutrient from the intestine.

These villi consist of numerous blood vessels, which absorb the food and transport it to the bloodstream.

increasing surface area to improve nutrient absorption between the digestive and circulatory systems

image result for how many calories of energy will 20 grams of carbohydrates provide in one gram provides 4 calories

consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.

the wetland preservation movement began in the u.s. in earnest with the clean water act (cwa) of 1972. although not specifically written to protect wetlands, the cwa is comprised of a series of regulations designed to prevent pollutants from contaminating u.s. waters.