Question

Practice Questions Th e stions are for practice. All possible content may not be represented in this subset ofte are receptors that respond to mechanical energy or deformation of their cell membrane. nors respond with a burst of activity but rapidly adapt and reduce firing ratele chemoreceptors) The distance at which two points of touch can be perceived as separate sealth The back of the legs have a higher/lower density of receptors than the fingertips. Which of the have the shortest two-point touch threshold? S. Most of the hearing loss in the elderly, caused by damage to the hair cells of the ear is all hearing loss. 6. Pressure waves in the perilymph fluid cause hair cells to 7. The middle ear ossicles transmit sound directly to the are receptors than transduce light energy The ability of the eyes to keep an image focused on the retina as a viewed object changes distance is called detect color vision. 11. Describe myopia, hyperopia, indicate the common term for each. Indicate where the image is focused in each condition. What type of lens might be used to correct the placement of the image on the retina? provide information about linear acceleration. 13. When light hits the pigment rhodopsin, found in (rods/cones), the dissociation of rhodopsin causes 10. 14. ions enter the taste cell, our brain perceives salty. 15. _ions enter the taste cell, our brain perceives sour. 16. Put the following statements, regarding the transduction of taste, in the proper sequence a. Gustatory complex perceives taste b. Ca++ channels open, Ca++ flows in C. Food particles activate taste ligands d. Sensory neuron depolarized e. Neurotransmitter released from taste cell 17. _are receptors that detect pain or itch. 18. (True of False) All of the different colors perceived by humans are the result of the activation of only four types of cones (blue, green, red, and yellow). 19. Rods, when hyperpolarized, (do do not release neurotransmitter, sending a message to the brain 20. Put the following terms in order starting with a sensory receptor in the finger detecting heat. corticospinal tract, somatosensory cortex, ventral root, dorsal root, ascending pathway, descending pathway, thalamus, motor cortex. Dorsal root, ascending pathway, thalamus, somatosensory cortex, motor cortex, descending pathway or corticospinal tract, ventral root

Answer 1

1) Mechanoreceptors

2) Peripheral chemoreceptors.

3)Tactile acuity.

4) back of leg has lower density of receptors than finger tips , therefore it has the shortest two points threshold 2-3 mm whereas in back of leg it is somewhere around 30-35 mm.

5) Sensorineural deafness is due to the loss of hair cells .

6) depolarization.

7) fluid filled labyrinth cochlea

8) photoreceptors

9) Accommodation of eye

10) Cones

11) Myopia - short sightedness.

When a parallel Ray of light coming from infinity fall before retina with accommodation at rest.

Use of diverging lens is required.

Hypermetropia: long sightedness

When a parallel Ray of light coming from infinity and falls beyond retina with accommodation at rest. Can be corrected with hypermetropia.

12) Vestibule gives information about linear acceleration.

13) rhodopsin in Rods it's dissociation cause bleaching

14) Sodium

15) H + ion

16) food particle activate taste glands

Sensory neuron depolarization

Calcium channel open and flows in

Neurotransmitters released from taste cell

Gustatory complex percieves taste

17) TRP receptors.

18) True

19) Rods as bipolar cell doesn't releases neurotransmitters when hyperpolarized.

20) ascending pathway ventra root thalamus somatosensory cortex dorsal root motor cortex descending pathway