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The Sliding Filament Theory: Muscle Contraction

Total questions: 34

Worksheet time: 26mins

Name
Class
Date
1.

___are thin filaments.

a)

troponin

b)

tropomyosin

c)

actin

d)

myosin

2.

___are thick filaments.

a)

actin

b)

myosin

c)

troponin

d)

tropomyosin

3.

___are regulatory proteins that cover the myosin binding site on the actin.

a)

troponin-tropomyosin

b)

sarcomere

c)

sarcolemma

d)

sarcoplasmic reticulum

4.

Calcium is stored in the ___.

a)

sarcoplasm

b)

sarcolemma

c)

sarcoplasmic reticulum

d)

transverse tubules

5.

___forms a crossbridge with actin.

a)

actin

b)

myosin

c)

calcium

d)

ATP

6.

___provides energy for muscle contraction and relaxation.

a)

cAMP

b)

ADP

c)

ATP

d)

M line

7.

___slides inward during muscle contraction.

a)

actin

b)

myosin

8.

Muscles are attached to bones by _____.

a)

Ligaments

b)

Tendons

c)

Cartilage

d)

Axons

9.

Contractile unit of a muscle.

a)

sarcomere

b)

motor unit

c)

fascicle

d)

myofibril

10.

Thick filaments are in a myofibril are

a)

ATPase

b)

Sarcoplasmic reticulum

c)

Actin

d)

Myosin

11.

Thin filaments in a myofibril are

a)

Sarcomeres

b)

Sarcoplasm

c)

Actin

d)

Myosin

12.

Calcium:

a)

causes ATP binding to actin

b)

increases the action potential along the sarcolemma

c)

binds to proteins on myosin

d)

triggers the binding of myosin to actin

13.

What is a crossbridge?

a)

Where myosin binds to actin

b)

Where the calcium crosses into the cytoplasm

c)

Where calcium binds with troponin

d)

None of the answers are correct.

14.

The energy needed to perform a muscle contraction comes directly from

a)

ATP

b)

Oxygen

c)

Glucose

d)

Calcium

15.

The neurotransmitter stored in the axon terminal identified as #3

a)

Calcium Ion (Ca2+)

b)

Protein Channel

c)

Acetylcholine

d)

Synaptic Cleft

16.

Which is voluntary?

a)

cardiac

b)

skeletal

c)

smooth

17.

Place the following events in sequence:

A) Your arm moves

B) An impulse travels along a motor neuron

C) You decide you want to move your arm.

a)

A B C

b)

C B A

c)

C A B

d)

A C B

18.

Which of the following best describes the power stoke?

a)

actin's troponin pulls on the myosin filament

b)

myosin heads pull on binding sites of the actin filament

19.

Which one shows the correct order of muscle organization?

a)

muscle, muscle fiber, myofibril, fascicle

b)

fascicle, muscle fiber, muscle, myofibril

c)

muscle, fascicle, muscle fiber, myofibril

d)

myofibril, muscle, muscle fiber, fascicle

20.

What binds to the Myosin Head to cause it to detach from the Actin?

a)

ATP

b)

ADP

c)

CNS

d)

ETC

21.

The gap between a neuron and a muscle cell: (#4 in the diagram)

a)

synapse

b)

sarcolemma

c)

vesicle

d)

Ca2+ ion

22.
A bundle of fascicles best describes a
a)
muscle fiber
b)
muscle tissue
c)
myofibril
d)
tendon
23.

The organelle that stores acetylcholine (ACh) in the axon is identified as #4

a)

Motor Neuron

b)

Axon Terminal of Motor Neuron

c)

Sarcolemma

d)

Vesicle

24.
This is a neurotransmitter used to create a muscle impulse
a)
Acetylcholine
b)
Calcium Ions (Ca2+)
c)
Sodium Ions (Na+)
d)
Protein Channels
25.
Contractile unit of a muscle.
a)
sarcomere
b)
motor unit
c)
fascicle
d)
myofibril
26.
A bundle of muscle cells.
a)
sarcomere
b)
fiber
c)
fascicle
d)
Tendon
27.
The functional unit of the muscle cell is the: 
a)
Sarcomere
b)
Osteon
c)
Myofilament
d)
Muscle fiber
28.
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
29.
A bundle of fascicles best describes a
a)
muscle fiber
b)
muscle tissue
c)
myofibril
d)
tendon
30.
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
31.
What is the structure that stores the Calcium in the muscle cell.  
a)
Sarcoplasm
b)
Sarcolemma
c)
Sarcoplasmic Reticulum
d)
Myoglobin
32.
Z represents
a)
Dendrite
b)
Axon Terminal
c)
Neurotransmitters
d)
Synapse
33.
The receptors are represented by
a)
8
b)
9
c)
10
d)
11
34.
What is a crossbridge?
a)
Where myosin binds to actin
b)
Where the calcium crosses into the cytoplasm
c)
Where calcium binds with troponin
d)
None of the answers are correct.

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