Homeostasis

In the tissue fluid surrounding your cells

• temperature and amount of water are kept almost constant

• temperature and amount of water vary

• temperature and amount of water vary depending on the season.

Homeostasis is

• a process that allows messages to travel through our body

• the process that allows our body to maintain a constant internal environment

• the process that allows our body to change internal temperature according to the season,

• Nothing to do with either of the other answers

Homeostasis doesn't

• help our cells work as efficiently as possible

• allow us to maintain a constant internal temperature

• help enzymes to work at the optimum rate

• allow our internal temperature to vary much

Animals that can control their body temperature are called

• endothermic

• homopatic

• pathetic

• ectothermic

Maintaining an internal temperature of about 37º means

• metabolism can slow down

• enzymes can work more efficiently and metabolism keeps going

• enzymes relax

Endothermic animals get their heat energy from

• petrol

• food

• their interior

The top layer of human skin is called

• epidermis

• dermis

• mitosis

Some cells in the epidermis contain melanin which

• helps us get a nice tan

• feeds skin tissue

• absorbs the ultraviolet rays in sunlight

Hairs on our skin are made of

• keratin

• melanin

• mitosis

The dermis is

• responsible for maintaining our internal temperature constant

• the lower layer of skin and is made of tissue that contains collagen fibres

• the top layer of skin

• a group of hairs that stop ultraviolet rays damaging other layers of skin