The Nervous System - Exam Questions
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The human nervous system is divided into two parts. Name each of these parts
Central nervous system (CNS) Peripheral nervous system (PNS)
Draw a large diagram of a neuron and label the following parts: dendrites, axon, myelin sheath
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distinguish between the function of an interneuron and a sensory neuron by writing a brief sentence on each
Interneuron: Transmit impulse within the CNS (or from sensory to motor neuron) Sensory neuron: Transmit impulse (from sense organ) to CNS
How is a nerve impulse conducted along a neuron?
(Movement of) ions
Name the gap that exists between two neurons in close contact
Synaptic cleft
Give one possible cause for Parkinson’s disease
Decrease in dopamine levels
define a synapse
gap where two neurons come in close contact
difference between axons and dendrites
axons - transmits impulse away from the cell body dendrites - transmits impulse to cell body
part of the neuron in which neurotransmitters are produced
synaptic knob activated by ions
how impulse crosses the synapse
neurotransmitter release into synapse diffuses across the gap, binds to receptors, impulse starts in postsynaptic, enzymes breakdown neurotransmitter
role of mitochondria
provide energy
why do nerve impulses can only travel in one direction
neurotransmitter swellings only located of synpase
name the tissue X which covers and protects the spinal cord
meninges
what is a reflex action?