MDCAT Past Papers - Biology - UHS

341. Which structure respond when they are stimulated by impulse coming through motor neuron?

Receptors
Responses
Effectors
Transductors

342. The part of neuron fibre which conducts nerve impulses away from the cell body is:

Dendron
dendrites
Axon
Peripheral branch

343. The number of cranial nerves in human are:

31 pairs
12 pairs
24 pairs
62 pairs

344. Which of the following is the effect of sympathetic nervous system?

Constriction of bronchi
decrease in heart rate
Promotes digestion or peristalsis
dilates the pupil

345. Depolarization during conduction of nerve impulse is due to:

Inward movement of Na+
Inward movement of K+
Outward movement of K+
Outward movement of Na+

346. The nerve impulse which travels from node to node in myelinated neurons is called as:

Resting membrane Potential
Saltatory nerve impulse
Threshold stimulus
Initial nerve impulse

347. How many sodium ions are pumped out in response to two potassium ions transported into the membrane?

2
3
4
1

348. Taste buds on the tongue are of:

Pressure Receptors
Chemoreceptors
thermoreceptors
Photoreceptors

349. If stimulus is above --------,impulses travel to the brain along the sensory neuron.

Action Potential
Threshold potential
Resting potential
Recovery period

350. The reflex action is the phenomenon which only involves:

Brain,receptors,Spinal cord
Receptors,Neuron,Brain
Receptors,Effectors,Spinal cord
Receptors and effectors

351. In an action potential the permeability of sodium ions in the neuron increases due to:

Action of acetylcholine sterase enzyme
Opening of sodium channels/gates
Repolarization
Sodium ions forming an ionic bond

352. There is no clear difference between dendrites and axons in sensory neurons, except:

Thickness
Length
Terminal portions
None of above

353. In a typical nerve , the action potential duration is:

1 milli second
1 second
1 micro second
1 minute

354. During resting membrane potential condition:

outer surface of neuron is more positive
inner surface of neuron is more positive
both of these are equally positive
both of these are equally negative

355. The value of the active membrane potential of the neuron is:

0.01 Volts
0.05 Volts
0.02 Volts
0.07 Volts

356. The pressure receptors that receive deep pressure stimulus in humans body are called ;

Meissners corpuscles
Paccinian corpuscles
Red blood corpuscles
White blood corpuscles

357. In human myelinated fibres nerve impulse travels at ----- meters per second.

100-120
130-150
160-180
190-210

358. Nissl's granules are groups of:

Mesosomes
Lysosomes
Ribosomes
Chromosomes

359. During Non-conducting state, the neuron membranes is permeable to efflux of:

K+
Na+
Ca+
Cl-

360. Depolarization during conduction of nerve impulse is due to:

Inward movement of Na+
Inward movement of K+
Outward movement of K+
Outward movement of Na+