what happens when a neuron’s membrane depolarizes? 0 of 5 1.there is a net diffusion of na out of...
Post on 03-Jan-2016
215 Views
Preview:
TRANSCRIPT
What happens when a neuron’s membrane depolarizes?
Ther
e is
a n
et d
iffus
io...
Ther
e is
a n
et d
iffus
io...
The
neuro
n’s
volta
ge...
The
neuro
n ca
nnot s
...
The
insi
de of t
he c
ell..
.
20% 20% 20%20%20%
0of5
1. There is a net diffusion of Na out of the cell.
2. There is a net diffusion of K into the cell.
3. The neuron’s voltage inside becomes more positive.
4. The neuron cannot send an action potential.
5. The inside of the cell becomes more negative relative to the outside
:60
A common feature of action potentials is that they:
Cau
se th
e m
embr
ane
..
Can
trav
el in
more
th..
Are
trig
gered
by
a de
...
Move
at t
he s
ame
spe.
.
Res
ult fro
m th
e diff
usi..
20% 20% 20%20%20%
0of5 :60
1. Cause the membrane to hyperpolarize and then depolarize.
2. Can travel in more than one direction on an axon.
3. Are triggered by a depolarization the reaches the threshold.
4. Move at the same speed along all axons.
5. Result from the diffusion of Na and K into the cell.
Where are neurotransmitter receptors located?
On th
e nucl
ear m
emb...
at t
he nodes
of R
anvi
er
On th
e post
synap
tic ..
.
On th
e m
embra
ne o
f t..
On th
e m
yelin
shea
th
20% 20% 20%20%20%
0of5 :60
1. On the nuclear membrane
2. at the nodes of Ranvier3. On the postsynaptic
neuron’s membrane4. On the membrane of
the synaptic vesicles5. On the myelin sheath
Which of these correctly describes the distribution of ions
in a resting neuron?
Na
outsid
e, K
insi
de
K o
utsid
e, N
a in
side
Pro
tein
s out
side;
K ..
.
Na
& K o
utsid
e; w
ate.
..
Ca
outsid
e an
d insi
de
20% 20% 20%20%20%
0of5
:60
1. Na outside, K inside2. K outside, Na inside3. Proteins outside; K
and Na inside4. Na & K outside;
water inside only5. Ca outside and
inside
The large intestine in humans:
Dig
ests
all
types
of f
ood.
Is th
e lo
ngest
par
t of t
..
Abso
rbs
water
.
Is c
onnect
ed to
the
s...
All
of the
above
.
20% 20% 20%20%20%
0of5
1. Digests all types of food.
2. Is the longest part of the intestinal tract.
3. Absorbs water.4. Is connected to the
stomach.5. All of the above.
:60
If I roll a:
• 1 – On your own, no notes• 2 – On your own, with notes• 3 – With partner, no notes• 4 - with partner, with notes• 5 – as a class, no notes• 6 – as a class, with notes
From what you know about action potentials and synapses, propose three hypotheses for how various anesthetics
might prevent pain.
Types of SkeletonsEndoskeleton• Sponges, echinoderms and
invertebrates• Internal• Calcareous plates in
Echinoderms• Bone, cartilage or both in
vertebrates• Hydrostatic in other
invertebrates
Exoskeleton• Molluscs and arthropods• External• Plates of chitin or CaCO3
The Human Skeleton
• Living tissue• Functions:– Support– Blood production– Mineral storage– Muscle attachment– Protection
The Human Skeleton
• Starts as cartilage models– OSTEOBLAST cells turn the cartilage to bone– Begins in the middle of the bone by forming a
PRIMARY OSSIFICATION CENTER– Same thing begins to happen in the ends of the
bones, forming SECONDARY OSSIFICATION CENTERS
– When the two centers meet, bone growth stops
top related