Each muscle fiber contains tiny threads called which are made of myosin and actin. a. ligaments b. myofibrils c. myoactin d. atp

Option B, myofibrils

Explanation:

Myofibrils are parallel filament that constitute a muscle. It has repeating sub unit called as sacromere which helps in contraction. There are two types of filament in myofibrils - thin and thick filament.  

a)Thin Filament- They are made up of strands of actin protein  

b) Thick Filament- They are made up of strands of myosin protein

The partially overlapping layer of thin and thick filament constitute the scaromere.  

Hence, option B is correct.

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answer; i believe the correct answer is (a)0