1.
maintaining a stable internal environment in the body despite external changes (11)
2.
a change in the internal or external environment that triggers a response (8)
3.
the action taken by the body after detecting a stimulus (8)
4.
a nerve cell that carries electrical messages in the nervous system (6)
5.
a chemical messenger released by glands and carried in the blood (7)
6.
the part of the brain that regulates body temperature and other functions (12)
7.
a hormone that increases metabolic rate to produce more heat (8)
8.
the process of maintaining a stable body temperature (17)
9.
widening of blood vessels near the skin to release heat (12)
10.
narrowing of blood vessels to reduce heat loss (15)
11.
release of liquid from sweat glands that cools the body through evaporation (8)
12.
rapid muscle contractions that generate heat (9)
13.
the body system responsible for breathing and gas exchange (11)
14.
the body system that transports blood, oxygen, and nutrients (11)
15.
the body system that defends against pathogens and disease (6)
16.
the biological process that produces offspring (12)
17.
reproduction involving one parent producing identical offspring (7)
18.
reproduction involving fusion of male and female gametes (6)
19.
transfer of pollen from anther to stigma in plants (11)
20.
shedding of the uterus lining when fertilisation does not occur (12)
