Why is excretion an important process in our bodies?

Question

What is the difference between excretion, secretion and defecation? Give an example

Answer 1

The gila monster doesn't p**p, or urinate, or sweat. Everything it eats goes in and the bile in the digestive system breaks down the food and metabolizes it. Therefore, the saliva is poisonous.

Answer 2

I drank way too much Budwieser last night so this morning I defecated several times.

Answer 3

Excretion:

Excretion is the process of eliminating waste products of metabolism and other non-useful materials. In humans, the two major excretory processes are the formation of urine in the kidneys and the formation of carbon dioxide (a human's abundant metabolic waste) molecules as a result of respiration, which is then exhaled from the lungs. These waste products are eliminated by urination and exhalation respectively

Secretion:

Secretion is the process of segregating, elaborating, and releasing chemicals from a cell, or a secreted chemical substance or amount of substance. In contrast to excretion, the substance may have a certain function, rather than being a waste product.

Defecation:

Defecation is the final act of digestion by which organisms eliminate solid, semisolid or liquid waste material (f***s) from the digestive tract via the a**s. Humans expel f***s with a frequency varying from a few times daily to a few times weekly. Waves of muscular contraction known as peristalsis in the walls of the colon move fecal matter through the digestive tract towards the r****m. Undigested food may also be expelled this way; this process is called egestion.