Neuromuscular Junction

Front

What is a Threshold Stimulus?

Back

A stimulus strong enough to create an action potential in a neuron.

Front

What is the Neuromuscular Junction?

Back

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

Front

What happens when Acetylcholine (ACh) binds to receptor cells on the sarcolemma?

Back

An action potential moves down the sarcolemma, stimulating T-tubules.

Front

What is the Synaptic Cleft?

Back

The gap between the neuron and the sarcolemma.

Front

In what form are nerve impulses sent within the neuron?

Back

Electrical form.

Front

What role does Acetylcholine play in muscle contraction?

Back

It binds to receptors on the sarcolemma, initiating muscle contraction.

Front

What is the function of T-tubules in muscle fibers?

Back

They help transmit the action potential deep into the muscle fiber.

Front

What is a Motor Unit?

Back

A motor neuron and all the muscle fibers it innervates.

Front

What is the role of Calcium ions in muscle contraction?

Back

Calcium ions are released from the sarcoplasmic reticulum and trigger muscle contraction.

Front

What is the difference between Electrical and Chemical signals in neurons?

Back

Electrical signals are used for nerve impulses, while chemical signals (neurotransmitters) are used for communication between neurons.