Question

Excretion is a process of
(a)Removal of waste substances from the body
(b)Removal of feces from the body
(c)Removal of reproductive products from the body
(d)Removal of urine from the body

Answer 1

Hint: The excretory system in human consists of four main parts and they are kidneys (filters all the blood to remove urea from the blood), ureters (carry the urea from the kidney to the bladder), bladder (the balloon-like organ that collects the urea) and urethra (urea is excreted).

Complete step-by-step answer:
Excretion is a process of removal of waste products of metabolism (a waste product made by the body) from the body in the form of urine, sweat, and exhalation. If they accumulate, they would prevent the maintenance of a steady-state of the body.
The four main processes in the excretory system are:
Filtration- as part of the circulatory system all the blood in the body passes through the kidneys and they filter the blood to remove unwanted minerals, urea, and also excess water.
Absorption- the substances that the body needs are reabsorbed back into the blood after the blood is filtered.
Diffusion- the substances are transported into and out of the specialized cells of the kidney.
Excretion- from the kidneys the urine passes to the bladder through the ureters. The bladder uses muscles to force the urine out of the body through the urethra.

So, the correct answer is ‘Removal of waste substances from the body’.

Note: Kidneys filter about 125 ml of blood every minute and all your blood gets filtered 20 to 25 times per day. On average, your kidneys produce 1.5 liters of urine each day depending on the amount of water taken. Some kidney diseases are kidney failure (loses the ability to properly filter), bladder infection (patient needs to undergo very regular kidney dialysis), and kidney stones (larger stones may even get stuck and block the flow of urine and cause severe pain or bleeding).