Final answer:
Somatic/skeletal muscles, upper part of the esophagus, and diaphragm are related to the study of the muscular system in Biology.
Step-by-step explanation:
The subject of this question is Biology. Somatic/skeletal muscles, upper part of the esophagus, and diaphragm are all related to the study of the muscular system in the human body. Somatic/skeletal muscles are the muscles responsible for voluntary movements and are attached to the skeleton. The upper part of the esophagus is made up of skeletal muscle, which helps in swallowing. The diaphragm is a dome-shaped skeletal muscle that separates the thoracic and abdominal cavities and plays a key role in breathing.