Question | Answer |
digestive system | body system that breaks down food so the body can use the nutrients |
incomplete digestive system | a digestive system with a sac-like form, with single opening into which the food enters and from which undigested food remnants exit; example - hydra |
complete digestive system | digestive system consisting of a digestive tract and two body openings (mouth and anus) |
mechanical digestion | Physical breakdown of large pieces of food into smaller pieces |
chemical digestion | Process by which enzymes break down food into small molecules that the body can use |
esophagus | A muscular tube that connects the mouth to the stomach. |
saliva | digestive juice produced by salivary glands |
small intestine | in the digestive system, the long muscular tube where most digestion takes place |
stomach | the pouch-like body part below the esophagus, which stores and processes chewed food |
anus | opening through which undigested food remnants exit a digestive system |
liver | organ that produces bile, stores glycogen, and removes toxins from the body |
kidneys | paired organs that clean the blood, producing urine from waste |
excretory system | the system that removes metabolic wastes from the body |
large intestine | in the digestive system, the long organ that removes excess water from undigested food |
mouth | an opening through which food enters a digestive system |
bladder | organ that stores liquid waste before it leaves the body; the bladder can stretch to hold about a pint of urine |
enzymes | Catalysts for chemical reactions in living things |
stomach acid | Breaks down proteins, breaks them down into sugar and acids |