Question

Trace a water molecule from the drinking glass to absorption at ileum to excretion from the body to the atmosphere in exhaled air.

Answer 1

The pathway of water in our body is as follow-

After drinking water, from mouth water moves to stomach, small intestine and finally into large intestine . Large intestine is the main part where water absorption occur. Water absorption occurs in ileum and enters systemic circulation and this water is supplied to each and every cell of body. Blood reaches kidneys and its filtration occur.At the level of kidney, the water along with other excretory products forms urine and is excreted.

water lost in expiration.

During expiration, the air present in lungs is pushed out into the atmosphere. The lining of the lung is always in moist state. The moisture in the lungs makes the air present in lungs full of moisture. When we expire, the water in the form of moisture is removed along with expired air.