Unit 2A – Biology (Neurons and The Nervous System) Unit Exam

The knee-jerk reflex is controlled by interneurons in the

• action potential.

• spinal cord.

• resting potential.

• endocrine system.

• neurotransmitters.

Dendrites are branching extensions of

• neurotransmitters.

• endorphins.

• neurons.

• myelin.

• endocrine glands.

Nerve cells in the brain receive life-supporting nutrients and insulating myelin from

• glial cells.

• neurotransmitters.

• motor neurons

• hormones.

• sensory neurons.

Match each part of a neuron with its correct function.

• Receives incoming neural messages.

• synapse.

• Contains the nucleus and maintains the life of the neuron.

• dendrite.

• The junction where information is transmitted from one neuron to another.

• axon.

• Transmits neural messages to other neurons, muscles, or glands.

• association area.

• Region of the brain involved in integrating information.

• cell body.

An axon is

• a cell that serves as the basic building block of the nervous system.

• a layer of fatty tissue that encases the fibers of many neurons.

• an antagonist molecule that blocks neurotransmitter receptor sites.

• the extension of a neuron that carries messages away from the cell body.

• a junction between a sending and receiving neuron.

The strengthening of synaptic connections facilitates the formation of

• interneurons.

• endorphins.

• neural networks.

• glial cells.

• lesions.

The selective permeability of a neural membrane creates a(n)

• myelin sheath.

• resting potential.

• neural network.

• reuptake.

• dendrite.

The depolarization of a neural membrane can create a(n)

• action potential.

• myelin sheath.

• lesion.

• neural network.

• interneuron.

Motor neurons are an important part of the

• limbic system.

• reticular formation.

• peripheral nervous system.

• brainstem.

• motor cortex.

An undersupply of serotonin is most closely linked to

• Alzheimer’s disease.

• Schizophrenia.

• Parkinson’s disease.

• Depression.

• Euphoria.