APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -Agonist muscles are sets of muscles in which some of them contract while others relax. They produce movements through their own contraction and are responsible for generating specific movements. In contrast, antagonist muscles are those that interfere with the physiological action of another.

Detailed explanation-2: -Pectoralis major (chest) and the trapezius (upper back) Tibialis anterior and gastrocnemius (both anterior and posterior calf muscles) Abdominals (stomach) and erector spinae (lower back)

Detailed explanation-3: -An agonist is a drug that binds to the receptor, producing a similar response to the intended chemical and receptor. Whereas an antagonist is a drug that binds to the receptor either on the primary site, or on another site, which all together stops the receptor from producing a response.