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Page 1

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B4 Homeostasis
Homeost
asi
s
is
keepi
ng
a steady state
insi
de
the
body

Thi
s i
nvol
ves:

Keeping
a const
ant
b ody
tempe r
ature
Keeping
the
corr
e ct
l
evels
of
w at
er and
salt
Contr
oll
ing
the
amo unt
of
n…

Page 2

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Enzymes
Enzymesa
rec
a t
alyst
s
they
speed up chemical reactions.T
h eya
r
ep
rotei
ns,
l
arge
mol
ec ul
esma
d eu
po f l
ongc
h ai
nso
f aminoa
ci
d s .S
o mee n zymesb
reakd
ownl
arge
mol
ec ul
es,…

Page 3

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Temper
atur
e
Y our
bo dyg
a i
n sa
n dl
o oses
heat
toth ee
n v i
ronmen t
,
dependi
ngo
nh
owh ot
or
c oldi
t i
s.
T heb
igg er
th ed
i ff
e r
en cei

nt emp eratur…

Page 4

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War
ming
up
Shiver
ingw
a r
msu pt
heb
odyb
yma
kingmu
sclec
el
ls
contract quickly,
t
husr
espi
ri
n g
fast
era
n d pr
o duci
ng more ener
gy,w
h i
ch keeps us warm. I ti
s an automatic
response.

Hai
rss
tandu…

Page 5

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Heat
st
roke
H e at strokeo
c cursw
h e ny o u r bod y cannot lose heat fast enough, f
or
exa mp l
ei
n
hu mi dc
l ima t
es. C oreb
o dyt
emp e ratur
eso
f abov e 42 degrees Celsius…

Page 6

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Di
ff
usi
on
D i
ffu si
oni st
h eo
v erall
mo v
e me nt
o f
pa rti
cles f
rom high concentration
to low concentration.T
h i
so cc urs

be c ause mo l
ecu l
es in gase s an d
li…

Page 7

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Wat
er
Ani
ma l
st ha tl
i
v e in t
he sea do not
nor
mall
yh
a veap
r oblem w i
thw a terb
a lance ,

beca u set
he
concentration of dissolved chemicals (such as salts) in their bodies
and in the sea…

Page 8

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Ki
dneys
Ki
dneysc
ontr
ol water balance and excretion (
gett
ingr
i
do

fw astep
ro ducts
produced
byc
hemical
r
ea c ti
onsi
nc
e l
ls)
.S
mal
l mo l
e cul
ess
ucha
sw a ter
, glucose,
ionso
f sa l
t…

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