Use examples to explain the role of water in living things using the topics given below.?

Question

a) water as a solvent
b) water as a temperature regulator
c) water as a lubricant and transportation facilitator

Answer 1

1. All the substances in the protoplasm of a cell are
dissolved in water e.g sugars,amino acids, vitamins
mineral ions etc. Excretory materials e.g. urea dissolve
in water to be transported to the kidneys for excretion..
The products of digestion dissolve in water before being
absorbed in the gut.

2. Water has a specific latent heat of vaporisation, thus
when sweat evapoates from the body it removes large
amounts of heat energy so helping to cool the body in hot
conditions.

3. water in synovial fluid in joints acts as a lubricant. Water
in saliva helps to lubricate the ingested food.

Water in the plasma of blood dissolves all soluble materials to be transported in the blood; oxygen, digested food, excretory products etc

Answer 2

A. Oxygen must be dissolved into water in order to diffuse into the cells of all kinds of living things: into the fish's gills, into the capillaries in the wall of alveoli in human lungs, into the skin of a moist earthworm.

B. When I go into a walk-in freezer, my body does not freeze because my cells are mostly water and water resists temperature change.

C. Water is a component of saliva which mixes with food during chewing and helps food slide down through the esophagus to the stomach. In plants, the glucose is dissolved in water and moves through the phloem from the place where the sugars are made (the source) to the places where the sugars are used or stored (the sink). In people, the water in the bloodstream helps move the cellular, noncellular, and dissolved materials throughout the body.

Answer 3

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