skin
Definition
Skin is the largest organ of the body. It is a complex tissue that protects us from the environment, helps to regulate our body temperature, and allows us to sense the world around us.
Skin is made up of three layers: the epidermis, the dermis, and the subcutaneous tissue.
The epidermis is the outermost layer of skin. It is made up of dead cells that are constantly being shed. The epidermis is responsible for protecting the body from bacteria and viruses. It also helps to prevent water loss.
The dermis is the middle layer of skin. It is made up of living cells, including hair follicles, sweat glands, and oil glands. The dermis is responsible for providing skin with its strength and elasticity. It also helps to regulate body temperature and produce vitamin D.
The subcutaneous tissue is the innermost layer of skin. It is made up of fat and connective tissue. The subcutaneous tissue helps to insulate the body and protect it from injury.
Skin is an important organ that plays a vital role in maintaining our health. It is important to take care of our skin by protecting it from the sun, staying hydrated, and using sunscreen.
How can the word be used?
The apple was peeled and the skin was discarded.
Different forms of the word
Noun:
- the outer covering of an animal's body.
- the outer covering of a fruit or vegetable.
- a thin layer of something.
Verb:
- to remove the skin from something.
- to tan or cure animal skins.
- to be covered or coated with something.
Etymology
The word "skin" comes from the Old English word "scin", which also means "skin".
The first recorded use of the word "skin" in English was in the 8th century.
The word "skin" is an Old English word, and it is related to the German word "Haut" and the Dutch word "huid".
Question
What is skin?
AQA Science Exam Question and Answer
Question:
Explain the multifaceted functions of the skin as the body's largest organ, focusing on its role in protection, temperature regulation, and sensation.
Answer:
The skin, the body's largest organ, serves a range of vital functions crucial for overall health and well-being. Its versatility is evident in its roles as a protective barrier, a regulator of body temperature, and a conduit for sensory information.
Primarily, the skin acts as a protective shield, guarding against external threats such as pathogens, harmful chemicals, and physical injuries. Its layers provide a formidable defence mechanism, preventing the entry of harmful agents and reducing the risk of infections.
Temperature regulation is another vital role of the skin. Blood vessels in the skin's dermal layer help regulate body temperature by dilating to release heat or constricting to conserve it. Sweat glands release perspiration, which cools the body through evaporation, maintaining a stable internal temperature.
Furthermore, the skin is a remarkable sensory organ, containing an array of nerve endings that detect various stimuli like pressure, temperature, and pain. These sensory receptors provide crucial information about the environment, allowing us to respond appropriately to different stimuli.