Neural Control and Coordination · Question 7

Select the incorrect statement regarding synapses :

1. The membranes of presynaptic and postsynaptic neurons are in close proximity in an electrical synapse.
2. Electrical current can flow directly from one neuron into the other across the electrical synapse.
3. Chemical synapses use neurotransmitters.
4. Impulse transmission across a chemical synapse is always faster than that across an electrical synapse.

Match List-I with List-II : Choose the correct answer from the options given below :

1. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
2. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
3. (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
4. (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)

Match the following columns and select the correct option.

1. (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
2. (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
3. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
4. (a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)

Which part of the brain is responsible for thermoregulation?

1. Corpus callosum
2. Medulla oblongata
3. Cerebrum
4. Hypothalamus

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.