Neurons, Synapses, and Signaling

What part of the neuron receives incoming messages from other cells?

• nucleus

• cell body

• dendrites

• synaptic terminals

What structure(s) aid in speeding up synaptic transmission across the axon?

• Nodes of Ranvier

• dendrites

• myelin sheath

• both Nodes of Ranvier and the myelin sheath

The central nervous system

• consists of the brain and spinal cord

• consists of the nerves that communicate motor and sensory signals throughout the rest of the body

Structure D represents

• a sensory neuron

• a motor neuron

• an internueron

• a sensory receptor

Structure B represents

• a sensory receptor

• an interneuron

• a motor neuron

• a sensory neuron

During which stage of this action potential do sodium ions (Na+) flow through the sodium channels from the outside of the membrane to the inside of the membrane?

• threshold

• depolarization

• repolarization

• refractory period

During which stage of the action potential does the membrane return to its resting state?

• undershoot to threshold

• depolarization

• rising phase of the action potential

• falling phase of the action potential

An action potential

• is another name for a nerve impulse

• is an all or none response to the depolarization of the membrane of the nerve cell

• cannot occur unless the nerve cell is at its resting potential

• all of these answers are correct

What is released by the presynaptic membrane into the synaptic cleft?

• neurotransmitters

• excitatory neurotransmitters

• inhibitory neurotransmitters

• all of these are released by the presynaptic membrane

The sodium-potassium pump

• uses diffusion to attain -70mV

• uses ATP to create a membrane differential along the axon

• is stimulated by neurotransmitters

• is an example of passive transport across a membrane

Tags

NGSS.HS-LS1-3