The skin is part of your body’s integumentary system.
Your skin fulfills several vital functions:
-Skin repels water
-Skin guards against infection
-Skin helps maintain homeostasis
-Skin senses the environment
Epidermis : An outer layer. Contain many protein fibers that give the skin tough and protective qualities. (These cells are formed in the deepest part of the epidermis)
Dermis: An inner layer. Made of tissue that is strong and elastic. The dermis is rich in blood vessels, sweat and oil glands, hair, nails and sensory receptors.
Fatty tissue lies beneath a layer of dermis. It protects the body from extremes in temperature and it stores energy for future use.
Sweat glands help control body temperature and oil glands protect the skin by keeping it moist. They both are open to the surface through pores.
Oil glands: Scecrete an oil that moistens skin and hair and keeps them from becoming dry. Skin oils add flexibility and provide part of the skin’s waterproofing.
Sweat glands help maintain homeostasis: sweat glands secrete sweat when you become too warm. The sweat evaporates and cools the skin’s surface.
Hairs and Nails
Many cells in your hair and nails are actually dead but continue to perform important functions.
Hair: Shields your head from the sun and traps heat close to your head to keep you warm during winter. (body hair works the same way.)
Nails: Protect the tips of the fingers and toes from injury. Both are thick and tough epidermal cells which grows from the nail bed
Sensory Receptors
Part of the nervous system, sensory receptors are attached to the nerves in skin.
Your skin contains receptors that sense heat, cold, pain, touch, and pressure.
ex. Temperature receptors sense when an object is hot. -> pain receptors send signals to your brain telling you that you have been burned.
Growth
Through all your body’s growth and change, your skin has to grow, too.
From the base of the epidermis, most of the cells constantly grow and divide to form new cells as the older epidermal cells die or gets to be brushed off during daily activity.
Every 2-4 weeks, your skin surface is entirely new.
A percentage of household dust is actually dead skin cells.
Injuries and HealingBlisters burns, cuts, and bruises are some injuries result from the skin’s contact with outside world.
-The skin can usually repair simple injuries. (click->)
Burns can be caused by heat, electricity, radiation, or certain chemicals.
First degree burns heals in a day or two. (sunburns)
*Skin cells produce more of the skin pigment melanin when exposed to the Sun and the amount of melanin in your skin determines how dark your skin is.
Second degree and third degree burns can result fluid loss, infection and other complication as well as death.
Severe cold can also damage skin as well. The cells might get damaged by freezing and can cause frostbite.
Your skin fulfills several vital functions:
-Skin repels water
-Skin guards against infection
-Skin helps maintain homeostasis
-Skin senses the environment
Epidermis : An outer layer. Contain many protein fibers that give the skin tough and protective qualities. (These cells are formed in the deepest part of the epidermis)
Dermis: An inner layer. Made of tissue that is strong and elastic. The dermis is rich in blood vessels, sweat and oil glands, hair, nails and sensory receptors.
Fatty tissue lies beneath a layer of dermis. It protects the body from extremes in temperature and it stores energy for future use.
Sweat glands help control body temperature and oil glands protect the skin by keeping it moist. They both are open to the surface through pores.
Oil glands: Scecrete an oil that moistens skin and hair and keeps them from becoming dry. Skin oils add flexibility and provide part of the skin’s waterproofing.
Sweat glands help maintain homeostasis: sweat glands secrete sweat when you become too warm. The sweat evaporates and cools the skin’s surface.
Hairs and Nails
Many cells in your hair and nails are actually dead but continue to perform important functions.
Hair: Shields your head from the sun and traps heat close to your head to keep you warm during winter. (body hair works the same way.)
Nails: Protect the tips of the fingers and toes from injury. Both are thick and tough epidermal cells which grows from the nail bed
Sensory Receptors
Part of the nervous system, sensory receptors are attached to the nerves in skin.
Your skin contains receptors that sense heat, cold, pain, touch, and pressure.
ex. Temperature receptors sense when an object is hot. -> pain receptors send signals to your brain telling you that you have been burned.
Growth
Through all your body’s growth and change, your skin has to grow, too.
From the base of the epidermis, most of the cells constantly grow and divide to form new cells as the older epidermal cells die or gets to be brushed off during daily activity.
Every 2-4 weeks, your skin surface is entirely new.
A percentage of household dust is actually dead skin cells.
Injuries and HealingBlisters burns, cuts, and bruises are some injuries result from the skin’s contact with outside world.
-The skin can usually repair simple injuries. (click->)
Burns can be caused by heat, electricity, radiation, or certain chemicals.
First degree burns heals in a day or two. (sunburns)
*Skin cells produce more of the skin pigment melanin when exposed to the Sun and the amount of melanin in your skin determines how dark your skin is.
Second degree and third degree burns can result fluid loss, infection and other complication as well as death.
Severe cold can also damage skin as well. The cells might get damaged by freezing and can cause frostbite.
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