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Action Potentials/ Synaptic Transmission/ Muscle Contraction

Total questions: 35

Worksheet time: 2hrs 43mins

Name
Class
Date
1.
The operation of the sodium-potassium "pump" moves: 
a)
sodium & potassium ions into the cell
b)
sodium & potassium ions out of the cell
c)
sodium ions into the cell & potassium ions out of the cell
d)
sodium ions into the cell & potassium ions out of the cell
2.
Name the ion that is pumped into the axon to maintain resting potential. 
a)
Calcium
b)
Hydrogen
c)
Potassium 
d)
Sodium 
3.
What describes the phase of quick entry of sodium ions into an axon during an action potential? 
a)
passive transport
b)
depolarization
c)
ion transport
d)
repolarization 
4.
What generates a nerve impulse on the post-synaptic membrane? 
a)
Calcium binding with a receptor site
b)
Potassium leaking into the post-synaptic membrane 
c)
Neurotransmitter binding with receptor sites
d)
Neurotransmitter being removed from the synapse
5.
Neural transmission across a synaptic cleft is accomplished by: 
a)
the movement of sodium & potassium from the presynaptic neuron to the postsynaptic neuron.
b)
impulses traveling as electrical currents across the gap. 
c)
impulses causing the release  of a neurotransmitter signal and its diffusion across the gap.
d)
impulses ricocheting back and forth across the gap.
6.
-70 mV is the measure of a
a)
Threshold Potential
b)
Action Potential
c)
Resting Potential
d)
End Point Potential
7.
A membrane potential becoming less negative is called
a)
hyperpolarization
b)
depolarization
c)
repolarization
d)
polarization
8.
When a neuron is depolarized, what are the first channels to open?
a)
Sodium
b)
Potassium
c)
Calcium
d)
ACTH
9.
What number on the graph represents the Hyperpolarization phase?
a)
1
b)
2
c)
3
d)
4
10.
Name the ion that is pumped into the axon to maintain resting potential. 
a)
Calcium
b)
Hydrogen
c)
Potassium 
d)
Sodium 
11.

W

a)

Axon terminal

b)

Neurotransmitters

c)

Postsynaptic membrane

d)

Synapse

12.

Neurotransmitters are released from the

a)

Dendrites

b)

Post-synaptic terminal

c)

Presynaptic terminal

d)

Axon

13.
X
a)
Axon Terminal Button
b)
Neurotransmitters
c)
Dendrite
d)
Synapse
14.

Y

a)

Axon Terminal

b)

Neurotransmitters

c)

Dendrite

d)

Synapse

15.
Z
a)
Dendrite
b)
Axon Terminal
c)
Neurotransmitters
d)
Synapse
16.
Skeletal Muscle contraction is initiated when the ________ sends a message to the muscle cell.  
a)
Muscle cell
b)
Neuron
c)
Gland
d)
None of the above
17.

The neurotransmitter that signals muscle contraction is called...

a)

Acetylcholine

b)

Myosin

c)

Actin

d)

Calcium

18.
Region where a motor neuron comes in close contact with a muscle cell.
a)
neurotransmitter
b)
muscular dystrophy
c)
muscle tension
d)
neuromuscular junction
19.

Calcium:

a)

Causes ATP binding to actin and power stroke to occur

b)

Is the best ion EVER!

c)

Binds to proteins on myosin

d)

Binds to troponin, helping expose the active site on actin

20.
The functional unit of the muscle cell is the: 
a)
Sarcomere
b)
Osteon
c)
Myofilament
d)
Muscle fiber
21.

What protein is wrapped around actin that covers up it's active sites is called:

a)

Troponin

b)

Tropomyosin

c)

Calcium

d)

None of the above

22.

The Ions that are responsible for activating Troponin and twisting Tropomyosin.

a)

Sodium

b)

Calcium

c)

Potassium

d)

Magnesium

23.
What is the name of the connective tissue covering that covers the entire muscle organ?
a)
endomysium
b)
perimysium
c)
epimysium
24.
What is the name of the Thick filaments?
a)
Actin
b)
Myosin
c)
Myoglobin
d)
Titan
25.
What is the name of the thin filaments in the muscle cell?
a)
Actin
b)
Myosin
c)
Myoglobin
d)
Titan
26.
What two chemicals are necessary for muscle contraction to occur?
a)
Niacin and Potassium
b)
Calcium and ATP
c)
Sodium and Potassium
d)
Ach and Potassium
27.
What is the connective tissue covering of a muscle fascicle?
a)
endomysium
b)
perimysium
c)
epimysium
28.

Identify one factor that can cause the first sodium channel to open in a muscle cell.

a)

Calcium ions being released from the sarcoplasmic reticulum.

b)

Acetylcholine from a motor neuron attaching to a receptor on muscle fiber.

c)

Calcium ions binding to troponin

d)

ATP causing the myosin heads to pop up.

29.

This attaches the muscle to the bone:

a)

ligament

b)

aponeurosis

c)

epimysium

d)

tendon

30.

Name for a bundle of muscle fibers:

a)

actin

b)

mysoin

c)

fascicle

d)

sarcomere

31.

Why does hyperpolarization occur during an Action Potential?

a)

Na+ channels open first

b)

K+ channels open second

c)

K+ channels are slow to close

d)

The Na+ / K+ pump is always working

32.

What is the charge inside the axon when the neuron is "at rest"?

a)

-70 mV

b)

-55 mV

c)

40 mV

d)

55 mV

33.

This muscle type is involuntary and lines hollow organs, airways and blood vessels:

a)

Smooth

b)

Cardiac

c)

Skeletal

34.

Synaptic vesicles:

a)

Contain Calcium ions

b)

Contain Neurotransmitters

c)

Contain Receptors

d)

All of the above

35.

Why is a "2nd Messenger" needed?

a)

Because actin is lame

b)

There is no such thing as a 2nd messenger, Mr. Dalton!

c)

Because of reasons beyond human comprehension

d)

Because neurotransmitters cannot cross the membrane of the postsynaptic terminal

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