NEET 2012 · Class 11

Locomotion and Movement

Which one of the following pairs of chemical substances, is correctly categorised?

  1. (A)Calcitonin and thymosin - Thyroid hormones
  2. (B)Pepsin and prolactin - Two digestive enzymes secreted in stomach
  3. (C)Troponin and myosin - Complex proteins in striated muscles
  4. (D)Secretin and rhodopsin - Polypeptide hormones

The NCERT line that answers it

Verbatim line

Increase in $\text{Ca}^{++}$ level leads to the binding of calcium with a subunit of troponin on actin filaments and thereby remove the masking of active sites for myosin.

Chapter
Locomotion and Movement
Section
17.2.2 Mechanism of Muscle Contraction
Page
5
Words matched
50 of 53

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

8333, emb=0.9091, combined=0.8788). Verified: high — The span explicitly mentions both troponin and myosin in the context of striated muscle contraction, confirming they are proteins involved in muscle function.

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