Question

Which one is not an excretory organ?
A. Skin
B. Kidney
C. Intestine
D. Liver

Answer 1

Hint:- An organ in the gastrointestinal tract that runs from the stomach to the anus through a long, continuous tube. In the abdominal body cavity, they are situated inferior to the stomach. The mesentery, a thin vascular membrane, connects them to the posterior wall of the abdomen.

Complete step-by-step solution:-
Option A is incorrect. Through the development of sweat by sweat glands, the skin plays a part in excretion. Sweating extracts excess water and salt, as well as a small amount of urea, a by-product of the catabolism of proteins. The liver is an incredibly significant excretory organ.
Option B is incorrect. The kidneys extract nitrogen waste, such as urea, as well as salts and excess water, from the blood and excrete it in the form of urine. With the aid of millions of nephrons present in the kidney, this is achieved. The filtered blood travels by the renal vein (or kidney vein) away from the kidneys.
Option C is correct. Kidneys are the largest excretory organ in humans, which help remove excretory waste other than the kidneys, lungs, liver, and skin. Every day, the lungs expel a substantial amount of carbon dioxide and a substantial amount of water. Bile containing compounds such as bilirubin, biliverdin, degraded steroid hormones and vitamins are secreted by the liver. Most of these compounds go along with digestive waste. The skin contains sweat glands from which NaCl is secreted, with a small amount of urea, lactic acid, etc. The intestine is not an organ that excretes, but a digestive organ.
Option D is incorrect. As toxic compounds are broken down by the liver, the by-products are excreted into the bile or blood. Bile by-products enter the intestine and, in the form of faeces, leave the body. The kidneys flush out blood by-products and leave the body in the form of urine.
So, the correct answer is Option C.

Note:- Most of the digestive process is carried out by the small intestine, absorbing nearly all of the nutrients you get into your bloodstream from foods. The small intestine walls produce digestive juices, or enzymes, that work together to do this with enzymes from the liver and pancreas.