Solution: The following is the role of the liver, lungs, and skin in the excretion process:

Liver-

• The liver is the primary site for the elimination of inactive steroid hormones, cholesterol, medications, and vitamins.
• Haemoglobin is present in dead erythrocytes. This haemoglobin is also broken down into bile pigments such as biliverdin and bilirubin, which are wastes.
• Bile transports things to the colon, where they are removed together with wastes.

Lungs-

• Water in the form of water vapour is also expelled from the body through the lungs
• Loss of water increases in colder settings and decreases in humid, hot situations
• Several volatile materials are also ejected during the process of expiration

Skin-

• It is primarily responsible for bodily thermoregulation (cooling)
• Sweat is expelled through the skin. It’s full with nitrogenous trash. Sweat is excreted only when it is necessary, such as to cool the body.
• Sweat is made up of urea, sodium chloride, and lactic acid, and is expelled by sweat glands.
• The sebaceous glands eliminate hydrocarbons, sterols, and waxes through sebum.
• Sebum provides the skin with a protective greasy coating.