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Neural Control and Coordination · Question 8

NEET (UG) 2022MCQEasy📈 Topic in 25% papers+4−1
1

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.

Answer

(4) Impulse transmission across a chemical synapse is always faster than that across an electrical synapse.

Solution

As per NCERT, at electrical synapses the membranes of pre- and post-synaptic neurons are in very close proximity, and electrical current can flow directly from one neuron into the other — (1) and (2) are correct.

⇒ At a chemical synapse, chemicals called neurotransmitters carry the impulse across the synaptic cleft — (3) is correct.

⇒ NCERT states: impulse transmission across an electrical synapse is always faster than that across a chemical synapse.

∴ Statement (4) is incorrect.

Answer: (4)

NEET (UG) 2022

Keep practising — Neural Control and Coordination

2

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)
NEET (UG) 2022 (Phase 2)
3

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)
Out of syllabusNEET (UG) 2020
4

Which part of the brain is responsible for thermoregulation?

  1. Corpus callosum
  2. Medulla oblongata
  3. Cerebrum
  4. Hypothalamus
NEET (UG) 2019
5

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.
Out of syllabusNEET (UG) 2019
6

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
NEET 2018
7

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
NEET 2018
8

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
Out of syllabusNEET 2018
9

Myelin sheath is produced by

  1. astrocytes and Schwann cell
  2. oligodendrocytes and osteoclasts
  3. osteoclasts and astrocytes
  4. Schwann cells and oligodendrocytes.
NEET 2017
10

Receptor sites for neurotransmitters are present on

  1. pre-synaptic membrane
  2. tips of axons
  3. post-synaptic membrane
  4. membranes of synaptic vesicles.
NEET 2017
11

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
Out of syllabusNEET 2017

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