QUIZ Chp 16 Nervous System: Senses

Changes in the external and internal environment are ________ that are detected by the sensory system.

stimuli

Our body responds to the osmolarity of our blood plasma, but we are not consciously aware of it. Because we respond but are not aware, this is an example of a sensation, but not of a stimulus.

false

The bending of light as it passes through to different media (such as glass vs. water) is referred to as ___________.

refraction

Label the pattern of processing for rods and cones.

referred pain pathway.

see notes

Which nerve fibers cross at the optic chiasm?

Axons of ganglion cells from nasal halves of both retinas

Bleaching Reaction and Regeneration of Rhodopsin

Drag each label to the appropriate box to indicate whether each statement is associated with rods or cones.

Rods and cones face the light coming into the eye.

false

If the receptive fields of the skin's receptors were smaller, then

precision would be greater, but we would need more receptors to monitor the environment for stimuli.

Label the cells in the retina.

The eye measures about ________ in diameter.

2.5 cm

Conscious awareness of incoming sensory information is called

sensation

Indicate whether each item is composed of transparent (clear) material through which light passes, or if the item is an opaque structure not involved in the transmission of light.

Select all that are criteria for classifying a receptor.

- receptor distribution/location
-origin of the stimulus
-modality of the stimulus

The papillae on the tongue that do not contain any taste buds are the ________ papillae.

filiform

What type of receptors detect deep pressure and vibration?

Lamellated corpuscles

Label the visual impairment and the lenses uses for correction.

What is the most numerous type of receptor?

tactile receptors

When the eye is viewing a distant object, the ____________ muscle is relaxed and dilated.

ciliary

This will put tension on the suspensory ligament and flatten the ____________ .

lens

During accommodation, the ciliary muscle contracts and ____________ the diameter of the ciliary body.

narrows

This action reduces tension on the ____________ ligament.

suspensory

This results in the lens forming a ____________ shape.

convex

The brain can determine the static position of the head due to sensors in the

vestibule

The refractive indices between glass and oil are quite similar, as compared to the refractive indices between glass and air, which are quite different. Therefore, in which of the following situations will light bend the most?

when passing between glass and air

Modality

firing frequency of sensory nerve fibers

-the brain assumes that a signal from the olfactory epithelium must be for smell

Location

- receptive field
-number of nerves fibers firing
-concentration of receptors in a given area of skin

Intensity

-volume of sound
-only the most sensitive receptors are stimulated by weak stimuli

duration

changes in the firing frequency of sensory nerve impulses over time

tonic receptors