Neurochemical Signals and Action Potentials Quiz

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Which cells in the nervous system are electrically excitable and specialized in information processing?

Neurons (correct)

Schwann cells

Astrocytes

Oligodendrocytes

What happens to neurons once they reach maturity?

They die (correct)

They become interneurons

They divide

They become glial cells

Which cells in the nervous system are involved in the nutrition and maintenance of the nerve cells?

Schwann cells

Oligodendrocytes

Astrocytes (correct)

Neurons

Which part of the neuron is responsible for transmitting information to other cells?

Presynaptic terminal (D) Signup and view all the answers

Which type of neuron has one single stem axonal process that branches to form two processes?

Pseudounipolar neuron (C) Signup and view all the answers

Which of the following is responsible for maintaining the resting membrane potential in neurons?

Na+, K+ pump (C) Signup and view all the answers

What is the average resting membrane potential in mammalian neurons?

-70mV (A) Signup and view all the answers

What happens when the change in membrane potential in a neuron reaches a threshold value?

An action potential is generated (C) Signup and view all the answers

What is the role of receptors in neurons?

Receive neurochemical signals from other neurons (A) Signup and view all the answers

What is the equilibrium potential for an ion?

The concentration difference across the membrane (D) Signup and view all the answers

Which type of axons can have a velocity of over 90 m/s?

Larger and myelinated axons (A) Signup and view all the answers

What happens to the current in wider axons?

It travels faster (B) Signup and view all the answers

What is the term for the current 'jumping' from one node to another in myelinated axons?

Saltatory conduction (D) Signup and view all the answers

What causes the fusion of vesicles with the membrane at the axon terminal?

High levels of intracellular Ca2+ (C) Signup and view all the answers

Which class of neurotransmitters does dopamine belong to?

Catecholamines (B) Signup and view all the answers

Which ion is the resting membrane more permeable to?

K+ (D) Signup and view all the answers

What can change the resting membrane potential of neurons and muscle cells?

Synaptic signals (D) Signup and view all the answers

What happens when neurotransmitters bind to receptors on the postsynaptic membrane?

They open or close ion selective channels (A) Signup and view all the answers

What is the result of a postsynaptic potential that is more positive than the resting membrane potential?

Excitatory postsynaptic potential (EPSP) (C) Signup and view all the answers

What causes hyperpolarization in the postsynaptic cell?

Opening of K+ channels (A) Signup and view all the answers

Which organelles are contained in the cell body of a neuron?

Nucleus (D) Signup and view all the answers

What is the conducting unit of a neuron?

Myelin sheath (D) Signup and view all the answers

What is the function of the myelin sheath?

Facilitate conduction and provide electrical insulation (C) Signup and view all the answers

What cells in the nervous system produce the myelin sheath?

Oligodendrocytes in the CNS (D) Signup and view all the answers

What is the role of dendritic spines in a neuron?

Increase the receptive surface of the postsynaptic cell (B) Signup and view all the answers

Which one of these accurately describes the difference between the Central Nervous System and the Peripheral Nervous System?

The Central Nervous System consists of the brain and spinal cord, while the Peripheral Nervous System includes all the nerves outside of the brain and spinal cord. (C) Signup and view all the answers

What accurately describes the difference between a neuron and a neuroglial cell?

Neurons are responsible for transmitting electrical signals, while neuroglial cells provide support and protection to neurons. (B) Signup and view all the answers

What accurately describes the components of a neuron and their function?

The dendrites receive signals from other neurons, the axon transmits signals to other neurons, and the cell body contains the nucleus and other organelles. (C) Signup and view all the answers

What are the classifications of neurons based on their function?

Sensory neurons, motor neurons, and interneurons. (A) Signup and view all the answers

What accurately describes myelin and its origin?

Myelin is a fatty substance that insulates and speeds up the transmission of nerve impulses, and it is produced by neuroglial cells called oligodendrocytes in the central nervous system and Schwann cells in the peripheral nervous system. (D) Signup and view all the answers