Question

explain the role of skin and lungs in excretion .​

Answer 1

Answer:

The skin plays a role in excretion through the production of sweat by sweat glands. ... The lungs are responsible for the excretion of gaseous wastes, primarily carbon dioxide from cellular respiration in cells throughout the body.

Answer 2

Role of skin in excretion :

Human skin posses two types of glands

Sweat glands :

$\bigstar$ These excrete sweat. Sweat contain more amount of water, NaCL, Lactic acid small amount of urea.

$\bigstar$ The primary function of sweat is to facilitate a cooling on the body surface. It also helps in the removal of wastes mentioned above.

Sebaceous glands :

$\bigstar$ These secrete sebum which contain waxes sterois, other hydrocarbons and fatty acids. This secretion provides a protective oily covering for the skin.

Role of lungs in excretion :

$\bigstar$ Human lungs eliminate approximately 200 ml of Co, per minute and significant quantities of water per day in normal resting condition

$\bigstar$ Different volatile materials are also readily eliminated through the lungs

Even liver, Intestine and salivary glands play a role in excretion.

Liver :

$\bigstar$ Processes related to excretion like deamination omithine cycle etc occur here.

$\bigstar$ Cholesterol and bile pigments , degraded steriod hormones, cholesterol, drugs, vitamins are eliminated in the form of bile which ultimately go out along with digestive waste

Intestine :

$\bigstar$ Epithelial cells of colon excrete excess salts of calcium, magnesium and iron along with faeces

Salivary glands :

$\bigstar$ It helps in the elimination of some ions like Na+, CT- small amounts of nitrogenous wastes