Topic 11 HBC

What are the two main divisions of the nervous system?

• Central and Peripheral
• Sympathetic and Parasympathetic
• Somatic and Autonomic
• Brain and Spinal Cord

Which structure is part of the central nervous system?

• Brain
• Nerves
• Ganglia
• Axon terminals

How many pairs of cranial nerves leave the brain?

• 12
• 15
• 31
• 10

What is the primary function of sensory neurons?

• Carry information to the CNS
• Carry information away from the CNS
• Support and protect neurons
• Transmit motor signals

Where does the action potential begin in a neuron?

• Axon hillock
• Dendrite
• Synaptic cleft
• Myelin sheath

What term describes the change in the membrane potential from -65 mV to +40 mV?

• Depolarization
• Repolarization
• Hyperpolarization
• Resting potential

What happens when potassium ions move out of the axon?

• Repolarization
• Depolarization
• Hyperpolarization
• Action potential

What is the refractory period in an action potential?

• A period when the sodium channels cannot reopen
• A period when potassium channels open
• A period when the membrane is fully polarized
• A period when neurotransmitters are released

Where are action potentials generated in a myelinated axon?

• Nodes of Ranvier
• Axon terminals
• Synaptic cleft
• Dendrites

What is the role of the presynaptic membrane in the synapse?

• Releases neurotransmitters
• Receives neurotransmitters
• Generates action potentials
• Inhibits neurotransmitters