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WorksheetsSkin
Total questions: 19
Worksheet time: 12mins
What is the state of maintaining a constant internal environment called?
(a)
The part of the brain responsible for maintaining constant body temperature is called the:
(a)
Skin is a:
Organ
a network of blood vessels
a muscle
What is the outer/top layer of skin called?
epidermis
dermis
How many layers is the epidermis made up of?
2
4
3
What is the function of the cornfield layer?
to reduce water evaporation and prevents bacteria from entering body
to keep body warm
to make skin hard to pierce through
What is the pigment which is found in cells of the innermost layer of epidermis which give skin brown pigment and protect it from UV rays called?
(a)
How do the inner dermis elastic fibres change by time?
They become tighter by time and water causing them to become stressed and tear, leaving skin wrinkle
As the skin gets older, the fibres lose their elasticity, resulting in loose and wrinkled skin
Where is sweat produced?
in sweat glands
in pores
in sweat duct
What contracts, and pulls the hair upright, forming ‘goose pimples’ on the skin surface. When hair stands upright, it traps a layer of insulating air
Hair follicles
Nerve endings
Hair erector muscles
Where is sebum produced?
(a)
How is more heat produced by body when temperature falls below 37°C?
Our metabolic rate increases and we produce extra heat
Our brain tells our skin to produce heat
Our muscles relax to conserve heat
What is vasoconstriction?
The arterioles which supply blood to the skin, widen, so more warm blood flows through them
The arterioles which supply blood to the skin, become narrower (constrict), so less blood flows through them
what is vasodilation?
The arterioles which supply blood to the skin, constrict, so less blood flows through them and less heat is lost from the blood
The arterioles which supply blood to the skin, widen (dilate), so more blood flows through them and more heat is lost from the blood
Skin stores:
Vitamin D
Vitamin A,C
Vitamin B9
(a) Occurs when the body temperature falls well below normal. It happens when the body is no longer able to make enough heat to keep the body temperature normal.
The nerve endings are responsible for skin:
Excretion
Sensitivity
Cooling and warming
Melanin is found in which layer of the outer epidermis?
Granular layer
Malpighian Layer
Cornified layer
Functions of skin:
protection
movement
sensitivity
temperature regulation
respiration
