Neurophysio (REVIEW TEST)

Question 1

Autonomic receptor that is blocked by hexamethonium at the ganglia but not at the NMJ

Answer 1

Cholinergic nicotinic receptors

Question 2

66 y/o man with chronic hypertension is treated with prazosin by his physician. the treatment successfullt decreases his BP to whithin normal range. what is the MOA?

Answer 2

inhibition of alpha 1 receptors on vascular smooth muscle

Question 3

Response mediated by parasymptathetic muscarinic receptors

Answer 3

Erection

Question 4

Property of C fibers

Answer 4

have the slowest conduction velocity of ant nerve fiber type

Question 5

When compared with the cones of the retina, the rods

Answer 5

more sensitive to low intensity light

Question 6

Basilar membrane of the organ of corti

Answer 6

Apex responds better to low frequencies than the base

Question 7

feature of the sympathetic but not the parasympathetic

Answer 7

Preganglionic neurons originate in the thoracolumbar spinal cord

Question 8

Autonomic receptor mediates an increase in heart rate

Answer 8

Adrenergic B1 receptors

Question 9

Cutting this structure on the left side causes total blindness of the left eye

Answer 9

optic nerve

Question 10

Reflex responsible for monosynaptic excitation of ipsilateral homonymous muscle

Answer 10

myotactic/strecth reflex

Question 11

type of cell in the visual cortex responds best to a moving bar of light

Answer 11

complex

Question 12

administration of which of the ff drugs is contraindicated in a 10 y/o child with a history of asthma

Answer 12

propanolol

Question 13

adrenergic receptor produces stimulatory effects by the formation of inositol 1,4,5 triphosphate (IP3) and an increase in intracellular calcium

Answer 13

alpha 1 receptors

Question 14

the excessive muscle tone produce in the decerebrate rigidity can be reversed by

Answer 14

cutting the dorsal roots

Question 15

part of the body woth the largest representation on the motor cortex

Answer 15

fingers

Question 16

Autonomic receptors mediates secretion of epinephrine by the adrenal medulla

Answer 16

cholinergic nicotic receptors

Question 17

Cutting which structure on the right side causes blindness in the temporal field of the left eye and the nasal field of the right eye

Answer 17

Optic tract

Question 18

a ballet dancer spins to the left. during the spin, her eyes snap quickly to the left. the fast eye movement is

Answer 18

nystagmus

Question 19

solute with a much lower concentration in the CSF than in the cerebral capillary blood

Answer 19

sodium

Question 20

autonomic drugs that stimulate adenylate cyclase

Answer 20

Norepinephrine

Question 21

step in the photoreception in the rods

Answer 21

metrahodopsin II activats transducin

Question 22

pathogens that produce fever cause

Answer 22

shivering

Question 23

Olfactory system

Answer 23

receptor cells are neurons

Question 24

lesion of the chorda tympani

Answer 24

impaired taste function

Question 25

produce maximum excitation of the hair cells in the right horizontal semicircular canal

Answer 25

rotating the head to the right

Question 26

The inability to perform rapidly alternating movements is associated with lesion of the

Answer 26

cerebellum

Question 27

Autonomic receptor that is activated bu low concentrations of epinephrine released from the adrenal medulla ad causes vasodilation

Answer 27

Adrenergic B2 receptors

Question 28

Complete transection of the spinal cord at the level of T1 would most likely result in

Answer 28

temporary loss of stretch reflexes below the lesion

Question 29

sensory receptor potentials

Answer 29

graded in size, depending on stimulus intensity

Question 30

Cutting which structure causes blindness in the temporal fields of the left and right eye

Answer 30

Optic chiasm

Question 31

structure which primary function is to coordinate rate, change force, and direction of movement

Answer 31

Cerebellum

Question 32

Reflex responsible for polysynaptic excitation of contralateral extensors

Answer 32

Flexor withdrwal reflex

Question 33

Characteristic of nuclear bag fibers

Answer 33

detect dynamic changes in muscle length

Question 34

muscle stretch leads to a direct increase in firing rate of which type of nerve

Answer 34

group Ia

Question 35

a 42 y/o woman with eleavted BP, visual disturbanes, and vomiting has increased urinary excretion of VMA. A computerized tomographic scan shows an adrenal mass that is consistent with a diagnosis of pheochromocytoma. while awaiting surgery,she is treated with phenoxybenzamine. what is the MOA?

Answer 35

Decreasing IP3/Ca

Question 36

Patients are enrolled in trials of a new atropine analog. what is expected

Answer 36

Increased AV node conduction velocity