Nervous System

All motor neurones are multipolar.

The bipolar neurons of the retina are also called bipolar cells. Choice A would be true of anaxonic neurons. Choice B would be true of unipolar neurons. Choice C would be true of multipolar neurons.

The stapes presses onto the oval window to transmit the vibration of the tympanic membrane to the cochlear fluid.

In order for the action potential to be passed from the neuron to the postsynaptic membrane (of the receiving cell), a neurotransmitter must be released to cross the synaptic cleft.

Schwann cells produce the myelin sheath of peripheral neurons. Oligodendrocytes produce the myelin sheath for central neurons.

The influx of positive Na ions changes the polarisation of the cell from negative inside to positive inside at that location on the membrane. This reversal is called depolarisation.

The “premotor cortex” in fact lies just anterior to the precentral gyrus, which is the primary motor area. Your premotor cortex allows you to make choices about which movement is appropriate.

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 vagus nerves carry 90% of the parasympathetic signals.

Adrenergic receptors bind adrenalin (and noradrenalin) which is another name for epinephrine (and norepinephrine).