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Functions of Nerve and Muscle: Excitation of Muscle

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Questions and Answers

What is the term for the localized change in the potential of an axonal membrane?

Resting membrane potential
Depolarization
Synaptic transmission
Action potential (correct)

What is the primary function of a neuron?

To respond to stimuli (correct)
To contract muscles
To produce neurotransmitters
To maintain a constant resting membrane potential

What is the primary difference between non-myelinated and myelinated nerve fibers?

The type of neurotransmitters released
The speed of impulse transmission (correct)
The presence of a node of Ranvier
The size of the axon

What is the role of neurotransmitters in the nervous system?

To communicate with target neurons at synapses (B) Signup and view all the answers

What is the term for the imbalance of ions and other substances between the cytoplasm and ECF?

Electrical potential (B) Signup and view all the answers

What is the term for the site where one neuron sends a message to a target neuron?

Synapse (A) Signup and view all the answers

What is the primary function of synaptic vesicles in the presynaptic neuron?

To store and release neurotransmitter molecules (B) Signup and view all the answers

What is the role of neurotransmitters in the synapse?

To bind to receptors on the postsynaptic neuron and influence its firing (C) Signup and view all the answers

What is the result of activation of postsynaptic receptors?

The opening or closing of ion channels in the cell membrane (D) Signup and view all the answers

What is the purpose of the synaptic cleft?

To provide a gap for neurotransmitter molecules to diffuse across (D) Signup and view all the answers

What is a characteristic of a single axon?

It can have multiple branches, allowing it to make synapses on various postsynaptic cells (D) Signup and view all the answers

What is the result of depolarizing the inside of a muscle cell?

The muscle cell becomes more positive (D) Signup and view all the answers

What is the function of the somatic nervous system in relation to muscle tissue?

To control skeletal muscle cells (A) Signup and view all the answers

What is a motor unit composed of?

A motor neuron and all the muscle fibers it innervates (B) Signup and view all the answers

What is the purpose of the creatine phosphate pathway in muscle contraction?

To provide a quick source of ATP (B) Signup and view all the answers

What is the result of high frequency stimulation of a muscle?

Tetanic contractions with high frequency (A) Signup and view all the answers

What type of muscle contraction is characterized by a brief contraction followed by relaxation?

Muscle twitch (B) Signup and view all the answers

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