Exam 4: The Peripheral Nervous System

When light of suitable wavelength strikes a photoreceptor,the photopigment (absorbs or reflects)the light,causing the photopigment to (dissociate or regenerate).This photopigment transformation acts through a second messenger system to cause Na⁺ channels in the outer segment to (open or close).Subsequently,the photoreceptor (depolarizes or hyperpolarizes),which results in a(n)(increase or decrease)in release of an (excitatory or inhibitory)transmitter from its synaptic terminal.

Sour taste represents stimuli caused by ________________.

The ossicular system transmits the vibrations of the tympanic membrane to the oval window,the movement of which sets up pressure waves in the cochlear fluid.

Indicate the proper sequence of involvement in the visual pathway by writing the appropriate letter in the blank using the answer code. -second

Indicate the properties of rods and cones by using the answer code (options may be used more than once or not at all). -high acuity

Night blindness is due to a deficiency of vitamin C.

Prostaglandins suppress the sensitivity of nociceptors.

Each half of the visual cortex receives information from the opposite half of the visual field as detected by both eyes.

What does fluid movement in the cochlea cause?

When an individual sees pure red,only the red cones are stimulated.

Which statement is correct for the optic tracts?

At the optic chiasm,the fibres in the lateral half of each optic nerve cross over.

Match the following eye disorder with its description by using the following answer code (options may be used more than once or not at all). -eyeball too long

Match the following term with its description by using the answer code (options may be used more than once or not at all). -dependent on the overtones

The lateral geniculate nucleus is located in the ________ of the brain.

By ________,a stimulus of the same intensity does not elicit a receptor potential of the same magnitude.

Indicate the characteristics associated with each part of the ear by using the answer code (options may be used more than once or not at all). -contains the organ of Corti whose hair cells are bent during vibration of the basilar membrane

Coding of sensory information may result from which action?

__________ is our conscious interpretation of the external world as created by the brain from a pattern of nerve impulses delivered to it from sensory receptors.

Indicate the properties of rods and cones by using the answer code (options may be used more than once or not at all). -contain opsin and retinene