211. The tympanic cavity is
A
Columella
B
Middle ear
C
Eustachian tube
D
Internal ear
Answer :
Middle ear
212. The focal length of the lens in eye is controlled by
A
Vitreous humor
B
Ciliary muscles
C
Iris muscles
D
Pupil
Answer :
Ciliary muscles
213.
The figure shows an axon terminal and synapse. Select the option giving correct identifications of tables $$A - D$$
A
$$A$$ - Axon terminal; $$B$$ - Serotonin complex
B
$$A$$ - Action potential; $$C$$ - Neurotransmitter
C
$$B$$ - Neurotransmitter; $$D$$ - Receptor capsules
D
$$C$$ - Receptor; $$D$$ - Synaptic vesicles
Answer :
$$C$$ - Receptor; $$D$$ - Synaptic vesicles
214. A small region on the retina of the eye which contains only cones is called
A
Area centralis
B
Fovea centralis
C
Blind spot
D
Ora serrata
Answer :
Fovea centralis
215. Stimulation of a muscle fiber by a motor neuron occurs at:
A
the neuromuscular junction
B
the transverse tubules
C
the myofibril
D
the sacroplasmic reticulum
Answer :
the neuromuscular junction
216. Harderian gland occurs in
A
Whale
B
Frog
C
Birds
D
All of the above
Answer :
All of the above
217. Which one of the following pairs of structures distinguishes a nerve cell from other types of cells?
A
Vacuoles and fibres
B
Flagellum and medullary sheath
C
Nucleus and mitochondria
D
Perikaryon and dendrites
Answer :
Perikaryon and dendrites
218. In the resting state of the neural membrane, diffusion due to concentration gradients, if allowed, would drive
A
$${K^ + }$$ into the cell
B
$${K^ + }$$ and $$N{a^ + }$$ out of the cell
C
$$N{a^ + }$$ into the cell
D
$$N{a^ + }$$ out of the cell
Answer :
$$N{a^ + }$$ into the cell
219. Endolymph is contains white crystals of CaCO3 Called
A
Otoconia
B
Otoliths
C
Ear dust
D
All of the above
Answer :
All of the above
220. The nictitating membrane of rabbit is
A
Also called third eye lid
B
Situated in the inner corner of the eye
C
Movable across the eye ball to clean it
D
All of the above
Answer :
All of the above