Chapter 13 Eye & vision, and some chemical senses

Name the 5 taste modalities

Sweet, sour, salty, bitter, umami

What are tears and what structure secretes them?

Tears are lacrimal fluid that contains mucus, antibodies, and lysomes and are secreted by the lacrimal gland

You have been reading this book for a while and your eyes are getting tired. Which intrensic eye muscles are relaxingoing as you stare thoughtfully into the distance?

The Ciliary muscles and sphincter pupillate relax for distant vision.

What does bleaching of pigment mean and when does it happen?

Breakdown of retinal-opsin combination is called bleaching of the pigment. It occurs with exposure to light.

Name three types of papillae that house taste buds

Fungiform, folliate, vallate papillae

Sam's optometrist tells him that his intraoccular pressure is high. What is this condition, and which fluid does it involve?

High intraoccular pressure is called Glaucoma, and is due to an accumulation of aqueous humor.

What part of the visual field would be affected by a tumor in the right visual cortex? By a tumor compressing the right optic nerve?

Left visual field A tumor compressing the right optic nerve would affect both the right and left visual files in the right eye only.

Arrange in order that light passes through them to reach photo recep tors in the retina: lens, bipolar cells, vitreous humor, cornea, aqueous humor, ganglion cells

Light passes through the cornea, aqueous humor, lens, vitreous humor, ganglion cells, bipolar cells before it reaches photo receptors.

Why does your near point of vision move farther away as you age?

The near point moves farther away as you age because the lens becomes less flexible, so that it is unable to assume the more rounded shape required for near vision.

What is a blind spot, and why is it blind?

The optic disc is called the blind spot because it lacks photo receptors, so light focused on it cannot be seen.

For the following, indicate weather it applies to rods or cones Vision in bright light Only one type of visual pigment Most abundant in periphery of retina Many feed into one ganglion cell Color vision Higher sensitivity Higher acruity

Vision in bright light:cones Only 1 type of visual pigment: rods Most abundant in periphery of retina: rods Many feed into 1 ganglion cell: rods Color vision: cones Higher sensitivity:rods Higher acruity: cones