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Unit 3: Nerve Cells and Electrical Impulses

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Unit 3: Nerve Cells and Electrical Impulses

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Questions and Answers

What is the network of nerves that carries information to and from the CNS called?

Central nervous system

Peripheral nervous system (correct)

Effector nervous system

Synaptic nervous system

What are the muscles or organs of the body that bring about the response to the original stimulus known as?

Synaptic neurons

Effectors (correct)

Neurotransmitters

Receptor cells

What is the fatty insulating sheath that grows around many nerves called?

Synaptic receptors

Axon terminations

Dendrites

Myelin sheath (correct)

What is the wave of positive charge inside the axon when the neuron is stimulated called?

Action potential (B) Signup and view all the answers

What is the most distinctive feature of nerve cells?

The axon (D) Signup and view all the answers

What are the gaps between neurons where electrical impulses cannot directly cross known as?

Synapses (D) Signup and view all the answers

What do afferent neurons do?

Carry information from receptors to the CNS (D) Signup and view all the answers

What is the function of efferent neurons?

Carry messages from the CNS to different parts of the body (D) Signup and view all the answers

What is the role of the myelin sheath in nerve cells?

Provides insulation for nerve impulses (B) Signup and view all the answers

What is the result of the structure of the axon in nerve cells?

It changes permeability to sodium ions to create an electrical impulse (C) Signup and view all the answers