Question

If you drank a litre of water, what effect would this have on the osmotic pressure of your blood and how would the level of ADH change in your blood?

Answer 1

Water is an essential component of all the living beings and we are quite aware of that. All organisms require water for their sustainability. It maintains the body's fluidity and is also present in blood. Blood possesses aqueous nature by the presence of water.

Complete answer:
Drinking more water increases the volume of the body which results in dilution of blood and the osmotic pressure of the body decreases. Water maintains the osmotic balance of the body. Water is mostly present in fleshy fruits and vegetables. As skin has sweat glands underneath which will keep the body cool from inside when body temperature rises that is known as osmoregulation.
The osmotic reaction by the body will lead to the decreased levels of ADH. This eventually leads to reabsorption of water from tubules and if the water is not present in sufficient levels the ADH is not released.
Without water in the body, the body will shrink, as water helps in rigidity of the body, helps to maintain water in tissues and cells. Cells require water in the form of vacuoles for its growth and function. Water acts as a medium of transporter. It helps in absorbing elements that are nutrition from the food. It also eliminates toxic materials or substances from the body in the form of urine and sweat.

Note:
The organ which absorbs most water eliminated from the body is the small intestine. The small intestine is majorly responsible for water absorption. The small intestine followed by the large intestine absorbs not only water but food particles too which are carried with the blood stream for elimination. It helps the muscles of the body to tone up and also helps in elasticity of the skin. Without adequate water level the skin and muscle will lose elasticity and the skin will start to wrinkle up.