neuromuscular junction

The point at which the nerve cell reaches the sarcolemma of the muscle fiber is the _____.

• Neurotransmitter

• Acetylcholine

• Synaptic cleft

• Neuromuscular Junction

The gap between the nerve cell and sarcolemma is the ____ ___.

• Synaptic cleft

• Neurotransmitter

• Motor unit

• Neuromuscular junction

What is the specific neurotransmitter that stimulates the movement of skeletal muscles?

• GABA

• Acetylcholine

• Serotonin

• Dopamine

What is the name of the component that houses the neurotransmitters?

• Synaptic cleft

• Acetylcholine

• Receptors

• Synaptic vesicles

Once the action potential reaches the end of the pre-synaptic terminal what takes place?

• ACh is released into the synaptic cleft.

• Calcium is pumped into the sarcolemma.

• Calcium is pumped into the presynaptic terminal.

• The muscle contracts.

What is the role of acetylcholinesterase? (two answers)

• It allows acetylcholine to leave the synaptic cleft

• It creates acetylcholine out of acetic acid and choline

• It breaks acetylcholine down into choline and acetic acid

• It helps acetylcholine re-enter the neuron

What happens at the neuromuscular junction?

• A sensory neuron communicates with a motor neuron

• An action potential jumps from the muscle to the neuron

• A nerve signal traveling down a motor neuron can jump over to the muscle cell

• Muscle cells contract in response to a sensory neuron

An action potential is

• A positive charge that moves along the neurons

• A negative charge that moves along the neurons

• The neutral charge of cells at rest

Which of the following is NOT true about oxygen debt?

• During exertion, oxygen has been depleted

• In recovery, we owe the body some oxygen.

• Oxygen demands remain elevated in order to reduce high levels of lactic acid

• This is the biggest reason someone passes out after exerting a lot of energy?.

These projections, or myosin heads, that are found on the thick filaments are called _____.

• cross bridges

• Z lines

• A bands

• actin tails