Neuromuscular Junction & Sliding-Filament Theory

1.

Multiple Choice

30 sec

1 pt

Region where a motor neuron comes in close contact with a muscle cell.

neurotransmitter

muscular dystrophy

muscle tension

neuromuscular junction / Motor End Plate

2.

Multiple Choice

30 sec

1 pt

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

synapse

sarcolemma

vesicle

Ca²⁺ion

3.

Multiple Choice

30 sec

1 pt

The neurotransmitter that is released into the synpase to trigger muscle contraction.

Acetylcholine

Protein Channel

Calcium Ion (Ca²⁺)

Syanptic Cleft

4.

Multiple Choice

30 sec

1 pt

smallest unit of contraction in a muscle

sarcomere

motor unit

fascicle

myofibril

5.

Multiple Choice

30 sec

1 pt

Thick filaments are in a myofibril are

ATPase

Sarcoplasmic reticulum

Actin

Myosin

6.

Multiple Choice

30 sec

1 pt

Thin filaments in a myofibril are

Sarcomeres

Sarcoplasm

Actin

Myosin

7.

Multiple Choice

30 sec

1 pt

What two chemicals are necessary for muscle contraction to occur?

Niacin and Potassium

Calcium and ATP

Sodium and Potassium

Ach and Potassium

8.

Multiple Choice

30 sec

1 pt

What is the structure that stores the Calcium in the muscle cell.

Sarcoplasm

Sarcolemma

Sarcoplasmic Reticulum

Myoglobin

9.

Multiple Choice

30 sec

1 pt

Skeletal Muscle contraction is initiated when the ________ sends a message to the muscle cell.

Muscle cell

Neuron

Gland

None of the above

10.

Multiple Choice

30 sec

1 pt

The energy needed to perform a muscle contraction comes directly from

ATP

Oxygen

Glucose

Calcium

11.

Multiple Choice

30 sec

1 pt

What is a crossbridge?

Where myosin binds to actin

Where the calcium crosses into the cytoplasm

Where calcium binds with troponin

None of the answers are correct.

12.

Multiple Choice

30 sec

1 pt

___ and ___ are proteins bound to actin, which control the binding sites.

Troponin and tropomyosin

Myosin and actin

Calcium and Oxygen

Glycogen and hemoglobin

13.

Multiple Choice

3 mins

1 pt

Calcium:

causes ATP binding to actin

increases the action potential along the sarcolemma

binds to proteins on myosin

causes the troponin to move tropomyosin out of the binding site

14.

Multiple Choice

30 sec

1 pt

What state is the sarcomere in #1

Relaxed

Contracting

Fully Contracted

None of the above

15.

Multiple Choice

30 sec

1 pt

What state is the sarcomere in #2

Relaxed

Contracting

Fully Contracted

None of the above

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