Week 15 Quiz

Light from a reading lamp enters the eye. In what order does it pass the four structures of the light path?

Select one.

• Pupil → cornea → retina → lens
• Cornea → pupil → lens → retina
• Lens → cornea → pupil → retina
• Cornea → lens → pupil → retina

At night in a dark kitchen, someone can find the table and the doorway, but a red cup and a blue cup look like the same gray. Which photoreceptors are doing the work, and why is the color gone?

Select one.

• Cones, because cones are the photoreceptors that work best in low light
• The optic disc, because it detects shapes
• Rods, because they work in low light and detect no color
• Cones, because they detect no color

The cornea and the lens focus light onto the retina together, and the lens changes shape to keep near and far objects in focus.

True or false.

• True
• False

A doorbell's sound makes the tympanic membrane vibrate. Which ossicle, fixed to the eardrum, passes the vibration on first?

Select one.

• The malleus
• The incus
• The stapes
• The cochlea

Someone spins slowly on an office chair, then stops it with their feet, and the room seems to keep turning for a few seconds. Which structure best explains the lingering spin?

Select one.

• The cochlea, whose hair cells sense hearing
• The tympanic membrane, which keeps vibrating
• The occipital lobe, which processes vision
• The semicircular canals, whose fluid keeps moving

Which of these are among the five basic tastes? Select all that apply.

Select every option that applies.

• Sweet
• Umami
• Spicy
• Bitter
• Warm

During a stuffy cold, a favorite soup tastes flat even though the taste buds still respond to salty and savory. What best explains the flat flavor?

Select one.

• The taste buds stopped responding to every one of the five basic tastes during the cold
• The aroma cannot reach the olfactory epithelium, and flavor is mostly smell
• The cochlea stopped converting the sound of chewing
• The thalamus stopped relaying the taste signals

A splinter stings the skin of a finger. Which receptor class detects the tissue damage that is felt as pain?

Select one.

• Thermoreceptor
• Photoreceptor
• Nociceptor
• Chemoreceptor

The skin senses touch, surface temperature, and pain. Which receptor classes does the skin carry for those three jobs? Select all that apply.

Select every option that applies.

• Mechanoreceptor
• Photoreceptor
• Thermoreceptor
• Chemoreceptor
• Nociceptor

In the dot-and-cross card demonstration, a person keeps one eye on the cross and brings the card closer, and at one distance the dot disappears. Which structure explains the vanishing dot?

Select one.

• The fovea, where vision is sharpest
• The lens, which changes shape
• The iris, which narrows the pupil
• The optic disc, which has no photoreceptors