Biceps. Brachhil
There are no muscles listed in the question on which to give an answer.
You're going to have to be clearer which muscles you're asking about.
It functions as a direct object.
No
Yes.
They direct the muscles to help us move
direct
There is no direct object in this sentence.
Trip is the direct object.
Yes. There is your heart, and several other involuntary muscles.
Botox is used in the muscles and has no direct effect on a person's skin.
infraspinatus and teres minor