Neural Control and Coordination · Question 11

Which of the following statements is correct?

1. Cornea is convex, transparent layer which is highly vascularised
2. Cornea consists of dense matrix of collagen and is the most sensitive portion of the eye.
3. Cornea is an external, transparent and protective proteinaceous covering of the eye-ball
4. Cornea consists of dense connective tissue of elastin and can repair itself.

Nissl's bodies are mainly composed of

1. free ribosomes and RER
2. proteins and lipids
3. DNA and RNA
4. nucleic acids and SER

Which of the following structures or regions is incorrectly paired with its functions?

1. Medulla oblongata : Controls respiration and cardiovascular reflexes
2. Corpus callosum : Band of fibers connecting left and right cerebral hemispheres
3. Hypothalamus : Production of releasing hormones and regulation of temperature, hunger and thirst
4. Limbic system : Consists of fibre tracts that interconnect different regions of brain; controls movement

The transparent lens in the human eye is held in its place by

1. smooth muscles attached to the ciliary body
2. ligaments attached to the ciliary body
3. ligaments attached to the iris
4. smooth muscles attached to the iris

Myelin sheath is produced by

1. astrocytes and Schwann cell
2. oligodendrocytes and osteoclasts
3. osteoclasts and astrocytes
4. Schwann cells and oligodendrocytes.

Receptor sites for neurotransmitters are present on

1. pre-synaptic membrane
2. tips of axons
3. post-synaptic membrane
4. membranes of synaptic vesicles.

Good vision depends on adequate intake of carotene rich food. Select the best option from the following statements.

1. A, C and D only
2. A and C only
3. B, C and D only
4. A and B only

Photosensitive compound in human eye is made up of

1. opsin and retinol
2. transducin and retinene
3. guanosine and retinol
4. opsin and retinal.

Choose the correct statement.

1. Nociceptors respond to changes in pressure.
2. Meissner's corpuscles are thermoreceptors.
3. Photoreceptors in the human eye are depolarised during darkness and become hyperpolarised in response to the light stimulus.
4. Receptors do not produce graded potentials.

Destruction of the anterior horn cells of the spinal cord would result in loss of

1. commissural impulses
2. integrating impulses
3. sensory impulses
4. voluntary motor impulses.