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Transcript of Integumentary System
There are three layers of skin on our body. The epidermis is the outer layers formed by many dead, flattened skin cells. The inner layer right below the outer is made of living cells.
Both hair and nails are modified parts of the body that cover and protect our skin.
Hair and Nails
The hypodermis, also known as the subcutaneous layer, is the third layer of skin cells that insulates with fatty material known as adipose and acts as a barrier for our skin. This layer also contains many major blood vessels.
The sebaceous gland is a small gland in the skin which makes and releases an oily fluid into hair follicles to grease the skin and hair.
A hair follicle is a part of the skin that produces hair.
Sweat glands are glands that function throughout life by reacting to high body temperature because of heat or physical exercise. These glands are common on the forehead, neck, and back, where they produce excessive sweating on hot days and when a person is physically active. They also are responsible for the moisture that may appear on the palms of our hands and soles of our feet when a person is emotionally stressed.
The dermis is the second layer of skin below the epidermis. It is full of nerves, hair follicles, blood vessels, muscles, lymphatic vessels, sweat glands, sebaceous glands, sense receptors, and the arrector pili muscle.
Sensory receptors is a nerve ending that responds to the touch or feel of something. It can detect cold, heat, pressure, and pain.
Calluses are formed by pressure, friction, or abrasion of the skin. It is a toughened area of skin that has become somewhat thick.
The integumentary system's main function is to protect and insulate the human body. The system's main three parts are the skin, hair and nails.
How Each Layer Receives Nourishment From the Blood
Arrector Pili Muscle
The arrector pili is the smooth muscle attached to hair follicles. When they contract, or shrink, it causes our hair to stand on end creating skin dimples, more commonly known as goosebumps.
What happens if you burn a layer of skin?
Burns are often categorized as first-, second-, or third-degree, depending on how badly the skin is damaged. Both the type of burn and its cause will determine how the burn is treated.
All layers of the skin have a direct supply of blood except for the epidermis. This top layer is fed by nutrients from the blood cells in the second layer of skin, the dermis. Only the deepest layer of the epidermis, the stratum basale receives nourishment. All other cells pushed away from this die and are moved to the surface of the skin.
Every month, you have a whole new layer of skin.
The skin is the body's largest organ.
We lose 30,000 to 40,000 dead skin cells every minute.
In an average lifetime, we lose 40 pounds of dead skin.
By: Katy, Taylor, and Miranda