Question

Describe the role of liver, lungs and skin in excretion.

Answer 1

Role of the liver:

Liver is the largest gland in vertebrates. It helps in the excretion of cholesterol, steroid hormones, vitamins, drugs, and other waste materials through bile. Urea is formed in the liver by the ornithine cycle. Ammonia – a toxic substance – is quickly changed into urea in the liver and then eliminated from the body. Liver also changes the decomposed haemoglobin pigment into bile pigments called bilirubin and biliverdin.



Role of the lungs:

Lungs help in the removing waste materials such as carbon dioxide from the body.

Role of the skin:

Skin has many glands which help in excreting waste products through pores. It has two types of glands – sweat and sebaceous glands.

Answer 2

There are different types of biological activities which are happening in our body and excretion is one of the most important biological activities in our body.

The excretion helps to let out the unnecessary waste materials from our body.

There are different organs which are related with the excretion activities.

Such as;

1) Liver : Liver filters the blood which is flowing in the digestive system of our body.

2) Lungs: Lungs produce the main gaseous waste material of our body which is known as the Carbon dioxide.

3) Skin : Through the sweat glands on our skin we excrete sweat in form of liquid waste material.