Describe the role of liver, lungs and skin in excretion.
Liver, lungs, and pores and skin additionally play an vital function withinside the system of excretion. Role of the liver: Liver is the biggest gland in vertebrates. It enables withinside the excretion of cholesterol, steroid hormones, vitamins, drugs, and different waste substances via bile. Urea is shaped withinside the liver via way of means of the ornithine cycle. Ammonia - a poisonous substance - is quick modified into urea withinside the liver and thence removed from the body. Liver additionally modifications the decomposed haemoglobin pigment into bile pigments known as bilirubin and biliverdin. Role of the lungs: Lungs assist withinside the putting off waste substances which includes carbon dioxide from the body. Role of the pores and skin: Skin has many glands which assist in excreting waste merchandise thru pores. It has styles of glands - sweat and sebaceous glands. Sweat glands are tremendously vascular and tubular glands that separate the waste merchandise from the blood and excrete them withinside the shape of sweat. Sweat excretes extra salt and water from the body. Sebaceous glands are branched glands that secrete an oily secretion known as sebum.
