Page 187 - 86 human physiology part-2

Chapter 20

2. The retina does the following;

• A) allows vision in light and dark, using cones and rods
B) Gives depth perception using binocular vision
C) Contains the ciliary muscles that control the shape of the lens
D) Protects and supports the shape of the eye

3. This is the reason that we stop feeling the clothes that we are wearing

A) Merkel’s Discs are somewhat rigid in structure, and the fact that they are not encapsulated,
causes them to have a sustained response
• B) Meissner’s corpuscle are rapidly adapting or phasic, the action potentials generated
quickly decrease and eventually cease
C) Ruffini corpuscles is a class of slowly adapting mechanoreceptor
D) Pacinian corpuscles allow sodium ions to influx in, creating a receptor potential

4. When eating a piece of candy, I will use the following to sense that it is sweet

A) Fungiform papillae
B) Filiform papillae
C) Foliate papillae
D) Circumvallate papillae
• E) All of the above

5. If I have a cold, food may not taste as good to me because

A) The nerve fibrils are not functioning properly
B) My food will taste the same; taste and smell have nothing in common
C) Papilla become blocked by mucus and are unable to function
• D) Olfaction, taste and trigeminal receptors together contribute to the flavor of my food

6. Walking from a well lit room into a dark room would cause the following to occur

A) The sclera in the eye to open and eventually allow me to see in the dark
B) The extraocular muscles in the eye to open and eventually allow me to see in the dark
C) The cones in the eye to open and eventually allow me to see in the dark
• D) the rods in the eye to open and eventually allow me to see in the dark

7. Hair cells in the ear

A) Are the actual sensory receptors that will fire off action potentials when they are disturbed
B) Show a graded response, instead of the spikes typical of other neurons
C) “Rub” against the overhanging tectorial membrane
• D) All of the above

8. Eyesight decreases with age because

A) Older eyes receive much less light at the retina
B) There are numerous eye diseases that can affect an older eye

402 | Human Physiology