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is the relationship between the "A" and "I" bands in a myofibril?

Options

  1. AThey are found in separate myofibrils
  2. BThey are both located in the middle of the myofibril
  3. CThey are arranged alternately throughout the length of the myofibril
  4. DThey are both found only in the "H" zone

Correct answer

C. They are arranged alternately throughout the length of the myofibril

Step-by-step solution

.Skeletal muscles are known as voluntary muscles because their activities are under the voluntary control of the nervous system.The striated appearance of myofibrils is due to the distribution pattern of two important proteins - Actin and Myosin. The light bands contain actin and the dark bands contain myosin.The light bands in a myofibril contain actin and is called I-band or Isotropic bandThe actin filaments are thinner as compared to the myosin filaments. Hence, they are commonly referred to as thin filaments an

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