WEEK/TERM: THIRD TERM /WEEK 8
CLASS: Grade 3
DATE: 26th June, 2020
SUBJECT: Basic Science
TOPIC: The Skin
Notes for the Pupils
The human skin is the largest organ of the body. I protect us from microorganisms. If the skin is not properly taken care of, it can develop skin conditions such as Rashes, Eczema, Dandruffs, scabies and ringworm etc.
The skin is divided into two major layers: the epidermis and the dermis. The epidermis is the outer layer of the skin. It creates our skin colour while the dermis is under the epidermis, it contains hair filicide and sweat glands.
Melanin is the pigment that gives human skin, hair, and eyes their colour. Dark-skinned people have more melanin in their skin than light-skinned people have. Melanin is produced by cells called melanocytes.
Functions of the Skin – Listed below from 1 to 4 are the functions of the skin.
- Protection: the skin prevents excess water loss from the body. It also protects the body against radiation from the sun.
- The skin is a sense organ: It is sensitive to heat, cold, touch, pain and pressure.
- The skin regulates body temperature.
- The skin helps in excretion e.g. water, salt and urine are excreted from the body through the skin.
Care of the Skin – We care for the skin by the methods listed below:
- Cleanliness – Bathe the skin regularly with soap and water to wash away sweat, oil and dead skin cells.
- Balanced diet – Eat balanced diets containing vitamins A and B2 and get enough sleep.
- Exercise – Take regular exercises to maintain a healthy skin.
What is melanin pigment and where is it found?