Structure of the Skin
What is the total surface area of the skin in an adult human?
About 1.80 m².
What substance does the skin eliminate through sweat?
Urea.
What pigment protects the skin from harmful sun radiation?
Melanin.
What happens to blood vessels in the skin when the body needs to conserve heat?
They constrict (vasoconstriction).
True or False: The skin is the largest organ in the human body.
True
What are the three main layers of the skin?
Epidermis, dermis, and subcutaneous tissue.
What vitamin is produced in the skin?
Vitamin D.
How does sebum help the skin?
It protects the skin from humidity and limits water loss.
What happens to blood vessels when the body needs to lose heat?
They dilate (vasodilation).
How does the skin help produce vitamin D?
It uses sunlight to synthesize vitamin D.
Which layer of the skin contains sweat glands and blood vessels?
The dermis.
What process allows small amounts of oxygen to be absorbed through the skin?
Gas exchange.
What condition makes the skin vulnerable to microbes?
Cuts.
What is the process through which sweat cools the body?
Evaporation.
What gas is absorbed in small amounts through the skin?
Oxygen.
What protein found in the skin provides a shield against harmful substances?
Keratin.
What function does the skin perform using sweat glands and sebaceous glands?
Excretion and protection from water loss.
What protective role does keratin play?
It acts as a shield against aggressive substances.
Name two ways the skin helps maintain a constant body temperature.
Vasoconstriction/vasodilation and sweating.
Sweat is mostly composed of this.
Water
What part of the skin contains the nerve endings responsible for sensing stimuli?
The dermis.
Name two types of stimuli that the skin can sense.
Pain, Pressure and temperature changes, heat
What kind of glands in the skin produce secretions that protect against water loss?
Sebaceous glands.
How does sweat help regulate temperature in hot conditions?
Sweat evaporates, removing heat from the body.
Sudoriferous glands are also known as
Sweat glands