10 Minute Neuroscience - Neurons

What is the primary function of neurons in the nervous system?

• To provide structural support to the brain.

• To transmit and receive information.

• To produce hormones for the body.

• To regulate body temperature.

How many neurons are estimated to be in a typical human brain?

• About 8.6 million

• About 86 billion

• About 860 million

• About 8.6 trillion

What two types of signals do most neurons use to communicate?

• Mechanical and thermal signals.

• Magnetic and gravitational signals.

• Electrical and chemical signals.

• Light and sound signals.

Which part of the neuron typically receives messages from other neurons?

• The axon hillock.

• The cell body (soma).

• The axon.

• The dendrites.

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What is the primary role of Nodes of Ranvier in an axon?

• To prevent current from leaking out of the axon.

• To allow the influx of positively charged sodium ions to regenerate the action potential.

• To produce the myelin sheath.

• To connect the axon terminals to the dendrites.

What is the typical width of the synaptic cleft?

• Approximately 80,000 to 100,000 nanometers.

• Approximately 20 to 40 nanometers.

• Several millimeters.

• About the width of a human hair.

Which type of neuron is characterized by a single axon and many dendrites, and is the most common type in the human nervous system?

• Bipolar neuron

• Unipolar neuron

• Multipolar neuron

• Pseudo-unipolar neuron

What is the primary function of interneurons?

• To control muscle movement.

• To carry sensory signals from sensory organs to the brain and spinal cord.

• To receive information from neurons and pass it on to other neurons.

• To form a single process that extends from the cell body.