The main function of the digestive system is to break food down into molecules that can be absorbed by cells. How are the food molecules absorbed into the cells to start the cellular respiration process? A.
Food molecules are broken down by oxidation and then released by cells.

B.
Food molecules are released into the cells by the respiration process.

C.
Food molecules are absorbed through the cell wall.

D.
Food molecules are absorbed through the cell membrane.

C

Explanation:

food molecules are absorbed through the cell membrane

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.