Lecture #12

Question 1

What are two types of equallibrium?

Answer 1

Static and dynamic

Question 2

What is static equilibrium?

Answer 2

Senses the position of the head when the body is not moving

Question 3

What is dynamic equilibrium?

Answer 3

Senses rotation

Question 4

How does static equilibrium work?

Answer 4

Basically it senses what direction gravity is pulling on the body

Question 5

Where is dynamic equilibrium located?

Answer 5

In the three semicircular canals

Question 6

What is a Krista ampullanis?

Answer 6

Sensory organ for dynamic equilibrium

Question 7

How does Dramamine work?

Answer 7

It acts as an antihistamine for a type of neurotransmitter active in the vestibular neuron pathway

Question 8

What are the four accessory structures for sight?

Answer 8

Eyelids, eyelashes, lacrimal apparatus, and extrinsic eye muscles

Question 9

What does the lacrimal apparatus do?

Answer 9

Production of tears

Question 10

What are the three layers of the eye?

Answer 10

The outer fibrous tunic, the middle vascular tunic, and the inner nervous tunic

Question 11

What are the 2 structures of the outer fibrous tunic of the eye?

Answer 11

The cornea and the sclera

Question 12

What does the cornea do?

Answer 12

It helps focus light And protects the eye

Question 13

What does the sclera do?

Answer 13

It is the white of the eye so it protects the eye and attaches muscles

Question 14

What is the anterior chamber of the eye?

Answer 14

It is located between the cornea and the lens and it contains fluid

Question 15

What does the anterior chamber of the eye due/assistant in?

Answer 15

It focuses The eye and changes the shape of the eye

Question 16

What are the three structures of the middle vascular tunic?

Answer 16

The choroid coat, ciliary body, and the iris

Question 17

What does the choroid coat do?

Answer 17

Provides blood supply to the eye and contains melanocytes to absorb extra light

Question 18

What does the ciliary body do?

Answer 18

It is the thickest portion of the eye and it changes the shape of the lens

Question 19

What does the iris do?

Answer 19

It is in front of the lens and it is pigmented to control light entering the eye

Question 20

What is aqueous humor?

Answer 20

It is a fluid in the anterior chamber of the eye

Question 21

What does aqueous humor do?

Answer 21

It provides nutrients and maintains the shape of the eye

Question 22

What is aqueous humor secreted by?

Answer 22

Epithelium

Question 23

What does the ciliary body do?

Answer 23

Farms in internal ring around the front of the eye so it can change the eyes shape

Question 24

What is accommodation in eyesight?

Answer 24

Changing of the lens shape to view close objects

Question 25

What does the Eye do to focus on close objects?

Answer 25

The Lense thickens and becomes more convex

Question 26

What does the Eye do to focus on distant objects?

Answer 26

The lens thins and becomes flatter

Question 27

What is the function of the Eyes Iris?

Answer 27

It controls the amount of light that enters the eye

Question 28

What does the iris consist of?

Answer 28

Connective tissue and smooth muscle

Question 29

What is the pupil?

Answer 29

It is the opening at the center of the iris

Question 30

What determines eyecolor?

Answer 30

Melanin

Question 31

What does dim light stimulate in the eye?

Answer 31

It stimulates the radial muscles and the pupil dilates

Question 32

What does bright light stimulate in the eye?

Answer 32

It stimulates the circular muscles constricting the pupil

Question 33

What is in the inner nervous tunic of the eye?

Answer 33

The retina which contains photoreceptors

Question 34

What are the three areas of the retina?

Answer 34

The macula lutea, the optic disc, and the fovea centralis

Question 35

What is the macula lutea?

Answer 35

A yellowish spot in the retina that contains a very high concentration of cones

Question 36

What is the optic disk?

Answer 36

A blind spot which is caused by the beginning of the optic nerve which means no visual receptors are in that spot

Question 37

What is the Fovea centralis?

Answer 37

It is the center of the macula lutea and it produces the sharpest vision

Question 38

What is the posterior compartment of the eye enclosed by?

Answer 38

The lens, ciliary body, and the retina

Question 39

What does the posterior compartment of the eye hold/do?

Answer 39

It contains a gel that maintains the eyes shape

Question 40

What are the three major groups/layers of retinal cells?

Answer 40

Photoreceptor cells, bipolar cells, and ganglion cells