Biology Cells unit: LT8 Review

Biology
Cells unit: LT8 Review
I can use a neuron to describe how passive and active transport work together to maintain homeostasis.
(Answers can be found on the next page.)
Fill in the T-chart for passive and active transport.
Passive
Active
Conc.
__  __
Conc.
__  __
______ energy
_______ energy
Examples:
Diffusion
_ _ _ _ cytosis

?
_ _ _ cytosis
__________ Diffusion
_ _+ / K+ _ _ _ _

Glucose
1.
2.
Add labels to the parts of a neuron.
Draw an arrow to indicate the direction that the impulse moves
through the neuron.
Put the images in the correct order to represent the sodiumpotassium pump. The first one is already labeled #1.
A.
B.
C.
D.
E.
Label the image of the action potential moving along an axon with the
letters for each question.
1. Where is the beginning of the action potential?
2. In which direction is it moving?
3. Where is the sodium-potassium pump doing its work?
4. What is the charge distribution inside and outside the axon when
the neuron is at resting potential?
Now that you have some background about neurons and action potentials, work on the original learning target.
I can use a neuron to describe how passive and active transport work together to maintain homeostasis.
Passive
Active
1.
3.
2.
Maintains Homeostasis
1.
3.
2.
Mrs. Loyd 
[email protected]
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9/21/16
http://loydbiology.weebly.com
Answers
Direction an action potential moves through a neuron.
Active
+ / K+ pump restores
3.
Na
1.
resting membrane
2. K+ voltage-gated ion channel
potential.
Maintains Homeostasis:
First the sodium channel opens and
The Na+ / K+ pump
sodium floods in reversing the
restores resting
polarity. (This is the action potential.)
membrane potential
Then it closes.
(homeostasis) by
Second, the potassium channel
pumping 3 Na+ out for
+
opens allowing K out, reducing the
every 2 K+ it pumps in.
reversal in polarity. Then it closes.
Na+
Mrs. Loyd 
[email protected]
Page 2 of 2
Passive
voltage-gated ion channel
9/21/16
http://loydbiology.weebly.com