Unit 4b Lessons 1-4 Review

A motor neuron and its associated muscle fibers is called the...

• Motor Neuron

• Axon

• Motor Unit

• Neuromuscular Junction

What is this part of the Motor Unit Called?

• Axon

• Motor Neuron Cell Body

• Synaptic Cleft

• Neuromuscular Junction

The motor neuron cell body connects the...

• Axon to the Central Nervous System

• Axon to the Neuromuscular Junction

• Spinal cord to the Brain

• The Muscle Fibers to Eachother

What is the term for the part of the Axon that branches on to the muscle fiber and contains Acetylcholine?

• Axon Terminal

• Axon Cell Body

• Synaptic Cleft

• Muscle Tissue

What is the term for the connection between the axon terminal and the muscle fibers?

• Synaptic Cleft

• Neuromuscular Junction

• Sarcomere

• Tendon

What type of control are our skeletal muscles under

• Voluntary control

• Involuntary control

The difference between large motor units and small motor units are

• The Number of Muscle Fibers controlled by the Motor Neuron

• The number of Motor Neurons present in the Motor Unit

• Large Motor Units are older that Small Motor Units

• Large Motor Units are used more often than Small Motor Units

When Calcium is released into axon terminal, it signals the release of what neurotransmitter? You may use the abbreviation if you have difficulty spelling

ACh or Acetlycholine diffuses across the... and into the muscle fiber

• Muscle tissue

• Synaptic cleft

• Motor Neuron Cell Body

• Axon

What does Acetylcholine do to the Sarcolemma?

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Answer explanation

Acetylcholine makes the Sarcolemma more permeable and opens the channel to let Na+ into the fiber and K+ out of the fiber.