BIO ch 19 Study Guide Version

Which is true of a neuron with a resting potential?

• The sodium pump has moved Na+ to the outside of the plasma membrane

Which is true of the action potential?

• The outside of the plasma membrane is negatively charged, and inside is positively charged.
  

A chemical synapse consists of

• A synaptic bulb of a presynaptic neuron, synaptic clef, the plasma membrane of a postsynaptic neuron

When an impulse reaches a synapse

• Chemical transmitters are released

The resting membrane potential is

• Polarized

What is the function of the nervous system

• Sensory, integrated, and motor information travels along the action potential

When current leaps across an insulating myelin sheat from node to node, the type of impulse conduction is called

• Saltatory Conduction
  

Neurotransmitters are released in synapses and bind to

• Receptors on the postsynaptic neuron

Which neuron could transmit a nerve impulse the fastest

• A large diameter neuron with myelin

No neuron can be sent through a neuron during

• The absolute refractory period

What role does calcium play in synaptic transmission

• Causes neurotransmitter release

Amines –mostly found in brain and CNS

Serotonin - thought to be involved in sensory perception, temperature regulation, control of mood, appetite, and induction of sleep

Dopamine - active during emotional responses, addictive behaviors, and pleasurable experiences; also helps regulate skeletal muscle tone

Epinephrine and Norepinephrine - play roles in arousal (awakening from deep sleep), dreaming, and regulating mood; norepinephrine is the main neurotransmitter used in the autonomic nervous system