Question

Contractile proteins are found in the_____.

Answer 1

Myofibril:

1. It is 1-3$\mu m$in diameter.
2. It has a light and dark bands arranged alternatively throughout its length.
3. It is made up of contractile proteins actin and myosin.
4. The actin and myosin proteins give the myofibril its striated appearance.
5. The light bands are made up of actin proteins while the myosin proteins constitute the dark bands.

Final answer: Contractile proteins are found in the myofibril.