Nervous System
Which statement about efferent impulses in the spinal cord is correct?
They travel along the spinothalamic and spinocerebellar tracts.
They pass along tracts that are located in the grey matter of the spinal cord.
The nerve cells that they travel through have their cell bodies located in the dorsal root ganglia.
The axons carrying these impulses pass through the ventral root of the spinal nerves.
The axons carrying these impulses pass through the ventral root of the spinal nerves.
Efferent impulses are motor impulses so leave the spinal cord via the ventral roots. “Spinothalamic” means from the spine to thalamus, i.e. ascending or sensory. Tracts are white matter not grey. Sensory neurons have their cell bodies in the dorsal root ganglia.
The axons carrying these impulses pass through the ventral root of the spinal nerves. Efferent impulses are motor impulses so leave the spinal cord via the ventral roots. “Spinothalamic” means from the spine to thalamus, i.e. ascending or sensory. Tracts are white matter not grey. Sensory neurons have their cell bodies in the dorsal root ganglia.
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In the spinal cord, the ascending tracts contain:A. White matter and transmit sensory information
B. White matter and transmit motor commands
C. Grey matter and transmit sensory information
D. Grey matter and transmit motor commands
Which sequence of ion movements describes the action potential?
A. Na+ move out of cell then K+ move in
B. K+ move in to cell then Na+ move out
C. K+ move out of cell then Na+ move in
D. Na+ move into cell then K+ move out
Which of the following substances is prevented from entering the brain by the blood-brain barrier?
A. Glucose
B. Nicotine
C. Pharmaceuticals
D. Alcohol
There are three ossicles in the middle ear. What are their names?
A. Malleus, stapedius, otolith
B. Cochlea, stapes, incus
C. Stapedius, ampulla, cochlea
D. Malleus, stapes, incus
The inner ear (or internal ear) may be described as a series of tubes. What are the tubes filled with?
A. Air
B. Perilymph
C. Endolymph
D. Perilymph and endolymph
What characterises a spinal reflex?
A. It involves rapid processing by the brain and a predictable response.
B. It is a predictable, unlearned and involuntary motor response.
C. It is a rapid, predictable, learned and involuntary motor response.
D. It involves stimulation of a motor neurone by a sensory neurone that originates within the CNS.
A multipolar neuron has more than one of what?
A. Dendrite attached to the cell body
B. Axon attached to the cell body
C. Synaptic terminal attached to the axon
D. Cell body
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