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NEET BIOLOGY Locomotion and MovementEasy

Question

Calcium is important in skeletal muscle contraction because it:

A

binds to troponin to remove the masking of active sites on actin for myosin.

B

activates the myosin ATPase by binding to it.

C

detaches the myosin head from the actin filament.

D

prevents the formation of bonds between the myosin cross bridges and the actin filament.

Step-by-Step Solution

According to the mechanism of muscle contraction described in the text, the release of calcium ions into the sarcoplasm leads to the binding of calcium with a subunit of troponin on the actin filaments. This action unmasks the active sites for myosin, allowing myosin heads to bind to actin and form cross-bridges to initiate contraction .

Exam Context & Concepts Covered

This question aligns with the NEET BIOLOGY syllabus, specifically targeting concepts from Locomotion and Movement. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

BIOLOGY Locomotion and Movementcalciumimportantskeletalmusclecontraction

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The contractile protein of skeletal muscle involving ATPase activity is:

A.tropomyosin
B.myosin
C.α-actinin
D.troponin
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A.Inflammation of joints due to accumulation of uric acid crystals
B.Weakening of bones due to decreased bone mass
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A.A-III, B-I, C-IV, D-II
B.A-I, B-III, C-II, D-IV
C.A-II, B-IV, C-I, D-III
D.A-IV, B-II, C-III, D-I
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Three types of muscles are given as a, b and c. Identify the correct matching pair along with their location in human body:

A.(a) Skeletal - Triceps
B.(a) Skeletal - Biceps
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Given below are two statements: Assertion (A): Osteoporosis is characterised by decreased bone mass and increased chances of fractures. Reason (R): Common cause of osteoporosis is increased levels of estrogen. In the light of the above statements, choose the most appropriate answer from the options given below:

A.(A) is not correct but (R) is correct.
B.Both (A) and (R) are correct and (R) is the correct explanation of (A).
C.Both (A) and (R) are correct but (R) is not the correct explanation of (A).
D.(A) is correct but (R) is not correct.
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Which one of the following pairs of chemical substances is correctly categorised?

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D.Calcitonin and thymosin - Thyroid hormones
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Select the correct statement regarding the mechanism of muscle contraction.

A.It is initiated by a signal sent by CNS via sensory neuron.
B.Neurotransmitter generates action potential in the sarcolemma.
C.Increased Ca++ level leads to the binding of calcium with troponin actin filaments.
D.Masking of active site for actin is activated.
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The characteristics and an example of a synovial joint in humans are:

A.Fluid-filled between two joints, provides cushion; Skull bones
B.Lymph filled between two bones, limited motion; Gliding joint between carpals
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D.Fluid cartilage between two bones, limited motion; Knee joint
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