Neuromuscular Junction Review

Front

What is the axon terminal of a motor neuron?

Back

The axon terminal is the end part of a motor neuron that makes a synaptic connection with a muscle fiber, releasing neurotransmitters to stimulate muscle contraction.

Front

What is the neuromuscular junction?

Back

The neuromuscular junction is the synapse or junction between a motor neuron and a skeletal muscle fiber, where the motor neuron communicates with the muscle to initiate contraction.

Front

Define a motor unit.

Back

A motor unit consists of one motor neuron and all the skeletal muscle fibers it innervates, working together to produce muscle contraction.

Front

What is the role of acetylcholine (ACh) in muscle contraction?

Back

Acetylcholine (ACh) is a neurotransmitter released at the neuromuscular junction that binds to receptors on the muscle fiber's sarcolemma, triggering muscle contraction.

Front

What is the synaptic cleft?

Back

The synaptic cleft is the small gap between the axon terminal of a motor neuron and the motor end plate of a muscle fiber, where neurotransmitters are released.

Front

What is the motor end plate?

Back

The motor end plate is the specialized region of the muscle fiber's sarcolemma that contains receptors for acetylcholine, facilitating the muscle contraction process.

Front

What is contractility in muscle tissue?

Back

Contractility is the ability of muscle fibers to shorten and generate force during contraction.

Front

What does excitability mean in the context of muscle tissue?

Back

Excitability refers to the ability of muscle cells to respond to stimuli, such as neurotransmitters, leading to muscle contraction.

Front

Define extensibility in muscle tissue.

Back

Extensibility is the ability of muscle fibers to stretch or lengthen when a force is applied, allowing muscles to return to their resting length after contraction.

Front

What is tension in muscle contraction?

Back

Tension is the force exerted by a muscle when it contracts, which can vary depending on the number of motor units activated.