Which of the following is included in the field of physics?

The correct answer encompasses phenomena that are fundamentally based on the principles of physics. Sound, electricity, and heat are all areas of study that fall squarely within the realm of physics.

Sound pertains to the study of waves, vibrations, and how they propagate through different mediums. Electricity involves the behavior of electric charges and the forces they exert, while heat relates to thermodynamics and energy transfer. Each of these subjects involves understanding the underlying physical laws and principles that govern their behavior, making them integral to the field of physics.

In contrast, the other options are more associated with different scientific disciplines. Chemical reactions are studied in chemistry, focusing on the interactions and transformations of substances. Cellular functions are primarily explored within biology, dealing with complex life processes at the cellular level. Anatomical structures are studied in anatomy and medicine, which concentrate on the physical organization of living organisms.