the functions of the deltoid muscle

Compose 400 words or more discussion to respond the following:

What are the functions of the deltoid muscle? What is the function of the biceps brachii muscle? Name the three gluteal muscles. What is the function of the gastrocnemius muscle? Define the term posture. What effect might bad posture have on the body? Baseball players, particularly pitchers, often incur rotator cuff injuries. List the muscles that make up the rotator cuff and explain the importance of theses muscles and their plain in the joint stability. Many drugs are administered by intramuscular injection. If the amount to be injected is 2 to 3 ml, which are is used?