This document has digital handwritten notes done in Goodnotes about biology in unit 1 btec level 3. Notes talk about neurons and how neurotransmitters transport different chemicals around the body such as serotonin. Structure of neuron cells is also explained.
The Schwann cell the to create Schwann cell membrane to
around protect
·
wraps axon
many layers of the axon.
--
·
-
- -
+ + + m+ M
t m + +
avonEngin
-
S
/
-
/
node of ranvier
activa membrane
·
melin
sheath
prevents
-
potential
· A allows
.
action
potential
whereincanpost
.
·
y
only in
neurons
insulated
by myelin .
of that
rec tion of the
· Schwann cells prevent movement lon in axon
&
jumping from
action
one to the .
next
·
The movement of out at the mode of ranvier shows that potentials one
o As the lon of the action
potential occurs les frequently, It toko les time > -
Increased impose speed.
·
Action potentials follow an
all
impose or
nothing principle . This mean that r i ve
the of the action
potential is
always
the same,
despite the strength of stimulus.
live will be
the
·
A stronger Stimulus will would in much
bigger frequency of impurer being read
along nearon
meaning ,
the
graph
and down.
going up
+ 40
membrane potential
· socium channels close .
.
·
potassium channels open t
so our more out
Depularisation
Depolarisation
/
M
-
diam ame close .
mV
& (2
73
No innt in)
&
I on out
-
50 · Influx of Nation
increasing .
· Sodium channel
opene
· become positive
it
thats why
S
yet up point.
I
-
60
mode.
-
70 resting
Nat/ k+ purp mode
~
2 in Sort 3 k
+
2 Not out in
-
75
↓
Time
<
↳ iont more i n
COMPLETED
Grom staining practical - 19th of October 2023
4:
30pm-5: 20 pm
By leaving the burner it
-
bowen
purple ,
·
on means we
orange
, ,
↓
sterilise the
practical a re a and the air around the
petri dish whilst
opening
it , to avoid contamination .
·
It is
important to
follow General
laboratory practice
crystal violet -
> iodine >
- ethand >
-
safronin, and be mature
enough
to behave in kind manners
b OxC done I
6-Ise
dosec to avoid accidents
during practicals .
Ist the loop ethend and let burn bunden bright
Dip innoculating in it on the burner until it
glows orange .
2nd contaminated ,
.
Open carefully the bacteria plate by not exposing it fully with the air wo it can yet with
impurities in cei
and take small
sample of the bacteria
a
and
place it on the slide
microscope .
the
3rd .
-
Heat fix slide on
top of burenburner fire about three timer and let it set .
colour stains the slide and rine each stain after 60 seconds at the end add 2
drops of ethanol
by adding the
on
yeth . Start ,
rine it followed by stain afterwards
staining
with safranin rising it.
and
it
5th .
Finally let the side
dry
and
put
it on a
microscope to me the
pink and pople bacteria .
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