Myelin sheath around the axons in the PNS is secreted by:

1. oligodendrocytes	2. axons
3. Schwann cells	4. ependymal

The brain stem includes all the following except:

The auditory tube [also called as the Eustachian tube] functions in equalizing pressure between the middle ear and:

The sensory organ of the otolith organ is called as:

In the given diagram of olfactory membrane, identify the olfactory receptor cell:

When one enters a dark room from a bright area:
1. retinol is converted to rhodopsin and eye sensitivity is decreased
2. rhodopsin is converted to retinol and eye sensitivity is decreased
3. rhodopsin is converted to retinol and eye sensitivity is increased
4. retinol is converted to rhodopsin and eye sensitivity is increased

The amount of light entering the human eye is regulated by:

The tympanic membrane:
1. is covered on both sides by skin
2. is covered on both sides by mucus membrane
3. is covered with skin on the outside and by mucus membrane on the inside
4. is covered with skin on the inside and by mucus membrane on the outside

The given diagram shows a section of a part of cochlea. A, B and C respectively are:

1. Reissner’s membrane, Basilar membrane and Tectorial membrane
2. Reissner’s membrane, Tectorial membrane and Basilar membrane
3. Basilar membrane, Tectorial membrane and Reissner’s membrane
4. Tectorial membrane, Reissner’s membrane and Basilar membrane

The auditory receptors in the human ear will be: