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NEET BIOLOGY Locomotion and MovementMedium

Question

According to the sliding filament theory:

A

Actin and myosin filaments slide over each other to increase the length of the sarcomere.

B

Length of A–band does not change.

C

I–band increases in length

D

The actin filaments slide away from A–band resulting in shortening of sarcomere

Step-by-Step Solution

According to the sliding filament theory, muscle contraction occurs when thin filaments (actin) slide over thick filaments (myosin). This pulls the actin filaments towards the centre of the 'A' band, pulling the 'Z' lines inwards and shortening the sarcomere. During this process, the 'I' bands get reduced in length, whereas the 'A' bands retain their length.

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 Movementaccordingslidingfilamenttheory

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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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Gout is a type of disorder which leads to:

A.Inflammation of joints due to accumulation of uric acid crystals
B.Weakening of bones due to decreased bone mass
C.Inflammation of joints due to cartilage degeneration
D.Weakening of bones due to low calcium level
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Match List I with List II: List I A. Fibrous joints B. Cartilaginous joints C. Hinge joints D. Ball and socket joints List II I. Adjacent vertebrae, limited movement II. Humerus and Pectoral girdle, rotational movement III. Skull, don't allow any movement IV. Knee, help in locomotion

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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D.(a) Smooth - Toes
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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?

A.Pepsin and prolactin - Two digestive enzymes secreted in the stomach
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C.Secretin and rhodopsin - Polypeptide hormones
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.
MediumSolve

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.
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