Exam 4: Principles of Neural and Hormonal Communication

The stronger the stimulus, the greater the frequency of action potentials generated and propagated in the afferent neuron.

Light is the only stimulus capable of stimulating the photoreceptors of the eye.

Match the structures, labelled a. through h., with their proper sequence of involvement in the visual pathway. a.bipolar neurons b.optic nerve c.lateral geniculate nucleus d.rods and cones e.visual cortex f.optic tracts g.ganglion cells h.optic radiations -seventh

Which of the following statements with regards to hearing is NOT correct?

Match the rods and cones, labelled a. through c., with their properties. (Options may be used more than once or not at all.) a.rods b.cones c.both rods and cones -confer vision in shades of grey

Each region of the auditory cortex becomes excited only in response to a specific tone detected by a selected portion of the basilar membrane.

The pitch of a sound is based on which of the following?

Short-wave lengths of light within the visible spectrum are sensed as violet or blue.

Match the structures, labelled a. through h., with their proper sequence of involvement in the visual pathway. a.bipolar neurons b.optic nerve c.lateral geniculate nucleus d.rods and cones e.visual cortex f.optic tracts g.ganglion cells h.optic radiations -eighth

Parasympathetic fibres issue from ____________________ and sacral spinal nerves.

Match the part of the autonomic nervous system, labelled a. through d., with its description(s). (Options may be used more than once or not at all.) a.sympathetic nervous system b.parasympathetic nervous system c.both sympathetic and parasympathetic nervous system d.neither sympathetic nor parasympathetic nervous system -postganglionic fibre that secretes acetylcholine

Which of the following statements regarding vision is NOT correct?

Which of the following conditions is caused by uneven curvatures in the lens?

The visual message detected by the retina is transmitted intact to the visual cortex.

Which statement applies correctly to tonic receptors?

Match the rods and cones, labelled a. through c., with their properties. (Options may be used more than once or not at all.) a.rods b.cones c.both rods and cones -high acuity

Match the ear parts, labelled a. through e., with their characteristics. (Options may be used more than once or not at all.) a.external ear b.middle ear c.cochlea in the inner ear d.semicircular canal in the inner ear e.utricle and saccule in the inner ear -contains receptive hair cells

Which of the following statements pertains to acetylcholine?

In somatosensory pathways, where do first-order neurons usually synapse with second-order neurons?

The origin of motor neurons for the somatic nervous system is in the ____________________ horn of the spinal cord.