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Locomotion and Movement · Question 12

RE-NEET (UG) 2024MCQEasy📈 Topic in 50% papers+4−1
1

Select the correct statements regarding mechanism of muscle contraction. Choose the most appropriate answer from the options given below:

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

Answer

(1) B, C and E only

Solution

A. Muscle contraction is initiated by a signal sent by the CNS via a motor neuron, not a sensory neuron. Incorrect.

B. The neurotransmitter (acetylcholine) released at the neuromuscular junction generates an action potential in the sarcolemma. Correct.

C. Increased Ca++ level leads to the binding of calcium with troponin on actin filaments. Correct.

D. This removes the masking of active sites for myosin on actin (unmasking), so the statement is incorrect.

E. Utilising the energy from ATP hydrolysis, the myosin head binds to the exposed active sites on actin to form a cross bridge. Correct.

Correct statements: B, C and E.

Answer: (1)

RE-NEET (UG) 2024

Keep practising — Locomotion and Movement

2

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

  1. A-II, B-IV, C-I, D-III
  2. A-I, B-IV, C-III, D-II
  3. A-II, B-IV, C-III, D-I
  4. A-III, B-I, C-II, D-IV
NEET (UG) 2023
3

Which of the following statements are correct regarding skeletal muscle? Choose the most appropriate answer from the options given below:

  1. B and C only
  2. A, C and D only
  3. C and D only
  4. A, B and C only
NEET (UG) 2023
4

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the most appropriate answer from the options given below:

  1. Both (A) and (R) are correct and (R) is the correct explanation of (A)
  2. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
  3. (A) is correct but (R) is not correct
  4. (A) is not correct but (R) is correct
NEET (UG) 2022
5

Which of the following is a correct match for disease and its symptoms?

  1. Arthritis - Inflamed joints
  2. Tetany - High Ca2+ level causing rapid spasms
  3. Myasthenia gravis - Genetic disorder resulting in weakening and paralysis of skeletal muscle
  4. Muscular dystrophy - An auto immune disorder causing progressive degeneration of skeletal muscle
NEET (UG) 2022
6

According to the sliding filament theory:

  1. The actin filaments slide away from A-band resulting in shortening of sarcomere.
  2. Actin and myosin filaments slide over each other to increase the length of the sarcomere.
  3. Length of A-band does not change
  4. I-band increases in length.
NEET (UG) 2022 (Phase 2)
7

Gout is a type of disorder which leads to:

  1. Weakening of bones due to low calcium level
  2. Inflammation of joints due to accumulation of uric acid crystals
  3. Weakening of bones due to decreased bone mass
  4. Inflammation of joints due to cartilage degeneration
NEET (UG) 2022 (Phase 2)
8

Chronic auto immune disorder affecting neuro muscular junction leading to fatigue, weakening and paralysis of skeletal muscle is called as :

  1. Gout
  2. Arthritis
  3. Muscular dystrophy
  4. Myasthenia gravis
NEET (UG) 2021
9

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

  1. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
  2. (a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
  3. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
  4. (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
NEET (UG) 2021
10

During muscular contraction which of the following events occur? Choose the correct answer from the options given below.

  1. B, D, E and A only
  2. A, C, D and E only
  3. A, B, C and D only
  4. B, C, D and E only
NEET (UG) 2021
11

Match the following columns and select the correct option.

  1. (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
  2. (a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
  3. (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
  4. (a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
NEET (UG) 2020

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