BIO-210 Lab 8 Quizizz

A loss of transparency in the _______ would result in ________.

• vitreous humor; conjunctivitis

• iris; glaucoma

• lens; cataract

• none of the above

Why are rods best suited for night vision?

• Rods have a low threshold for activation.

• Rods are primarily located within the fovea.

• Rods contain several visual pigments.

• This is false; cones are primarily responsible for low-light vision.

What processes take place for the lens of your eye to become rounder to focus on nearby objects?

• Ciliary muscles relax, suspensory ligaments tighten.

• Ciliary muscles contract, suspensory ligaments relax.

• Ciliary muscles relax, suspensory ligaments relax.

• Ciliary muscles contract, suspensory ligaments tighten.

Vibration of the _____ is transmitted at the ______ to produce the sensation of sound.

• stapes; oval window

• malleus; round window

• incus; oval window

• stapes; round window

You are at an incredibly loud concert. What is the reaction of your tensor tympani to the noise?

• It extends to allow free movement of the auditory ossicles, thus preventing hearing loss.

• It extends to prevent all movement of auditory ossicles.

• It contracts to reduce movement of the stapes.

• It contracts to pull the malleus medially and stiffens the tympanic membrane.

Where are the sensory receptors that respond to linear movements of the head?

• the utricle and saccule

• the anterior, posterior, and lateral semicircular canals

• the cochlear duct

• the vestibular duct and tympanic duct

Why can corneal transplant surgeries be performed between unrelated individuals without the risk of rejection?

• White blood cells rush to the new cornea to fight off infection.

• There are no blood vessels in the cornea, so white blood cells cannot attack the foreign tissue.

• Aqueous humor contains powerful antimicrobial chemicals.

• Lacrimal fluid contains powerful antimicrobial chemicals.

Low-frequency sounds vibrate the basilar membrane _______ because ________.

• near the round window; perilymph is incompressible

• near the oval window; of shorter wavelength

• far from the oval window; of longer wavelength

• against the vestibule; pressure waves are created in the endolymph of the vestibular duct

Which of the following is not one of the extrinsic muscles of the eye?

• Superior oblique

• Medial rectus

• Sphincter pupillae

• Inferior rectus

Which of the following is FALSE regarding the iris?

• The iris is a highly vascular structure, as it is part of the uvea.

• When the iris (and pupil) dilate, the lens is pulled flatter, accommodating far vision.

• The iris is comprised of the sphincter pupillae and the dilator pupillae.

• The iris controls the diameter of the pupil.