Final answer:
The study of the heart as a whole, considering its role in the circulatory system, is classified as systemic anatomy.
Step-by-step explanation:
The study of the heart involves examining structures of the body that work together to perform specific functions, which falls under the category of systemic anatomy. Systemic anatomy is the study of the structures that make up a discrete body system—a group of structures that collaborate to execute a unique body function. Considering the heart, systemic anatomy would explore not only the heart itself but also its integration with the circulatory system, comprising blood vessels and blood that the heart pumps throughout the body.
Gross anatomy, on the other hand, entails the examination of larger structures visible without magnification, while microscopic anatomy involves structures requiring a microscope to be seen. Developmental anatomy concerns the changes structures undergo over an organism's lifespan, but when examining the heart as a whole and its function in the circulatory system, systemic anatomy is the appropriate term to use.