The Skin
💡 The skin is the largest organ in our bodies.
Random Facts
Cutaneous membrane Skin colour is determined by the amount of
It relates to the skin Melanin
It is called the integument Reddish brown, black or yellow
That is why it is called the integumentary Found in the epidermis
system
Carotene
Pliable
Orange hue
To prevent it from breaking
Found in the hypodermis and the stratum
It is a dry membrane corneum in the epidermis
No oozing of fluids Oxyhaemoglobin
Keeps water and other molecules in Red
Keeps water out Found in the dermal reticular layer
Intact skin will not allow any pathogens from
entering
The role of keratin in the skin:
Offers resistance
Makes the skin impermeable to foreign substances
Reduces the H20 that enters through the skin
It is 60% hydrophobic
The Skin 1
, Functions of the Skin
The skin's main function is PROTECTION
It protects deeper tissues from:
Mechanical Damage
Direct hits etc
Keratin
Protein that offers resistance to the epithelium
Pressure receptors
Chemical Damage
Keratin
Impermeable to foreign substances
Pain receptors
Bacterial Damage
The skin's secretions have a low pH so it destroys Thermoregulation
the bacteria Sweating
Phagocytes engulf pathogens which prevents them Sweat glands are activated
from entering deeper structures
The body cools down on evaporation
UV Radiation of sweat on the skin
Melanin produces melanocytes which protect the Vasoconstriction and Vasodilation
skin from UV damage
Blood vessels dilate when the body is
If the body is exposed to a lot of UV the warm so they are closer to the skin
production of melanocytes will increase therefore heat is lost
Thermal Damage Blood vessels constrict when the body
Heat/cold/pain receptors respond the the changes of is cold so that they are further a way
environment and stimuli from the skin and therefore heat is
conserved
Desiccation
Hair erector muscles
A hydrophobic glycolipid
When cold the body cause these
Keratin
muscles to contract so that air can be
trapped between the hair and the skin
Excretion which reduces heat loss
When we sweat we excrete nitrogenous products: urea
and uric acid
Vitamin D
"When sunlight reacts to the modifies cholesterol in the
skin it synthesises Vitamin D
The Skin 2
💡 The skin is the largest organ in our bodies.
Random Facts
Cutaneous membrane Skin colour is determined by the amount of
It relates to the skin Melanin
It is called the integument Reddish brown, black or yellow
That is why it is called the integumentary Found in the epidermis
system
Carotene
Pliable
Orange hue
To prevent it from breaking
Found in the hypodermis and the stratum
It is a dry membrane corneum in the epidermis
No oozing of fluids Oxyhaemoglobin
Keeps water and other molecules in Red
Keeps water out Found in the dermal reticular layer
Intact skin will not allow any pathogens from
entering
The role of keratin in the skin:
Offers resistance
Makes the skin impermeable to foreign substances
Reduces the H20 that enters through the skin
It is 60% hydrophobic
The Skin 1
, Functions of the Skin
The skin's main function is PROTECTION
It protects deeper tissues from:
Mechanical Damage
Direct hits etc
Keratin
Protein that offers resistance to the epithelium
Pressure receptors
Chemical Damage
Keratin
Impermeable to foreign substances
Pain receptors
Bacterial Damage
The skin's secretions have a low pH so it destroys Thermoregulation
the bacteria Sweating
Phagocytes engulf pathogens which prevents them Sweat glands are activated
from entering deeper structures
The body cools down on evaporation
UV Radiation of sweat on the skin
Melanin produces melanocytes which protect the Vasoconstriction and Vasodilation
skin from UV damage
Blood vessels dilate when the body is
If the body is exposed to a lot of UV the warm so they are closer to the skin
production of melanocytes will increase therefore heat is lost
Thermal Damage Blood vessels constrict when the body
Heat/cold/pain receptors respond the the changes of is cold so that they are further a way
environment and stimuli from the skin and therefore heat is
conserved
Desiccation
Hair erector muscles
A hydrophobic glycolipid
When cold the body cause these
Keratin
muscles to contract so that air can be
trapped between the hair and the skin
Excretion which reduces heat loss
When we sweat we excrete nitrogenous products: urea
and uric acid
Vitamin D
"When sunlight reacts to the modifies cholesterol in the
skin it synthesises Vitamin D
The Skin 2
