Human Digestive System - Science Learning 7

Practice Human Digestive System questions with answers. This prep guide includes questions like, what happens to proteins in liver?, what happens to excess amino acids in liver?, what is absorbed in large intestine?, what is faeces?, where is faeces stored? and others below.

Human Digestive System Learning 7

Question: What happens to proteins in liver?

Answer: proteins reach the liver in the form of amino acids. These amino acids cannot be stored thus they are used in repairs of damaged cells and tissues and in growth. Excess amino acids are excreted.

Question: What happens to excess amino acids in liver?

Answer: When excess amino acids reach the liver, they are converted into urea, which is a major part of urine. This urea is transported to kidneys from where it is excreted out through urethra.

Question: What is absorbed in large intestine?

Answer: Undigested food enters the large intestine, only water and mineral salts are absorbed by large intestine and added to the blood, the remaining product is faeces.

Question: What is faeces?

Answer: Food we eat often contains cellulose that our digestive system cannot digest. Undigested food and cellulose form faeces.

Question: Where is faeces stored?

Answer: After passing through large intestine, the faeces is stored in rectum. Rectum is just above the anus. faeces is stored in rectum for a small period of time and then egested from the digested system through anus.