AP Bio Nervous System

The functional units of the nervous system are______.

• Neurons

• oligodendrocytes

• neuroglia

• none of the above

In humans, the central nervous system consists of the_____, which is housed in the ____ and the ______, which is housed in the _____.

• peripheral nervous systems; limbs; brain; skull

• brain; skull; spinal cord; vertebral column

• spinal cord; vertebral column; sensory neurons; limbs

• brain; vertebral column; spinal cord; skull

The three functions of the nervous system are associated with the different tissues. Which part of the neuron would be most active in detecting sensory input?

• axon

• cell body

• dendrite

• oligodendrocytes

Which statement is NOT true about the cells about the nervous system?

• A neuron can have only one axon

• A dendrite carries an electrical impulse away from the cell body

• There may be multiple dendrites on a single neuron

• A myelin sheath is a white insulating layer that covers many axons

The connection space between the dendrite of one cell and the axon of another cell is called a(n)____

• synapse

• neurotransmitter

• axonic connection

• threshold

The likely effect on a neuron of two excitatory signals and twenty inhibitory signals is

• transmission of a nerve impulse

• transmission of a nerve impulse releasing inhibitory neurotransmitters at the next synapse

• prohibiting the axon from firing

• confused integration

The sodium-potassium pump is primarily responsible for ____.

• the resting potential

• the action potential

• the excretion of salts

• the contraction of muscle fibers

Tags

NGSS.HS-LS1-3

Ion concentration differences produce an action potential creating a stimulus, The difference between a weak stimulus and an intense stimulus is_____.

• the action potential is graduated and a weak stimulus causes a small change in polarity

• weak stimuli only open sodium gates, strong stimuli also open potassium gates

• the frequency at which an axon fires

• a strong stimulus does not allow repolarization but sends a constant flow of ions

Tags

NGSS.HS-PS3-5

Neurotransmitters are molecules that cross the synaptic cleft and _____.

• always inhibit the postsynaptic neuron

• always excite or inhibit the postsynaptic neuron

• either excite or inhibit the postsynaptic neuron

• integrate the pre-synaptic action potential

Tags

NGSS.HS-LS2-3

The nucleus and the most of the organelles in a neuron are located in the

• dendritic region

• axon terminals

• axon

• cell body