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Page 1

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11.
1 How do
human bodi
es
respond
to
changes
insi
de
them
and
to
t
heir
envi
ronment
?
The nervous system

The
nervous
syst
em
enabl
es
humans
to
react
t
o t
hei
r
sur
roundi
ngs
and
coor
dinat
e t
hei
r
behavi
our
.…

Page 2

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Ref
lex
act
ions











What
happens:


1.R ecept
or
detect
s a
sti
mu l
us
change i
n t
he envi
ronment
2.S e nsor
y neur
one sends si
gnal
to
r
elay
n eur
one
3.Mo t
o r
neur
one sends
signal
to
ef
fect
o…

Page 3

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- the
water content of
the body
­ wat
e r
l
eaves t
he body vi
a t
he l
ung s
w hen
w e
breathe
out
an d vi
a t
he ski
n when we sweat
to
cool
us down, and
exce ss
water
is

l…

Page 4

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Sever
a l
hor
mo ne s
a r
e i
n vol
ved i
n
the
me nst
rual
cycl
e
of
a
w oman .
Hormo nes are i
nvolved
in
promoti
n g
the
r
elease
of an
eg g:
- Follicle stimulating hormone (FSH) i
s…

Page 5

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Very
rel
iabl
e
Wo men pr
o t
ected
all
t
he t
ime
Peri
ods more r
egular

May prevent
PMT
Prot
ect
aga i
nst
some diseases
e.g.
r
heumat
oid,
ar
thr
it
is.


Di
sadvant
ages:


Onl
y obt
ained
by pr
escri
pti
on…

Page 6

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11.
2 What
can
w e
do
to
keep
out
bodi
es
heal
thy?
A
heal
thy
diet
cont
ains
the
ri
ght
bal
ance
of
the
dif
fer
ent
f
oods
you
need
and
the
ri
ght

amount
of
ener
gy.


A
p er
son i
n
ma l…

Page 7

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Scur
vy

lack
of
vit
ami
n C

Cholesterol:

Chol
ester
ol
is
a subst
a nce
found
in
the
blood.
I
t
is
ma de
in
the
li
ver
(t
h e
amount
ma de
depends
on di
et
and
i
n her
it
ed f
actor
s)
and…

Page 8

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When new medi
cal
drugs
are
creat
ed,
t
hey
have
to
ext
ensi
vel
y t
est
ed
and
tr
ial
led
bef
ore
being
used.


1.Drugs
are
tested
in
a l
aborat
ory,
of
ten
on ani
mals,
t
o f
ind
o ut
i
f
they
are…

Page 9

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Class C tranquilisers, painkillers Up to two years in Up to 14 years in
prison or an unlimited prison or an unlimited
fine or both fine, or both


Drugs
change t
he chemi
cal
pr
ocess
in
people'
s
bodi
es s
o
that
t
hey
become dependent

or
addi…

Page 10

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- Hypnosis:
Agai
n,
pat
ient
s r
epor
t
success,
but
i
ts
eff
ect
s ar
e not
sci
ent
if
ical
ly

pr
oven.


Alcohol

- Aff
ects
the
nervous
syst
e m by
slowi
ng down r
ea ct
ion
s
and hel
ps
peopl
e…

Comments

Katie

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This was so useful, thanks so much :)

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