Systemic anatomy encompasses the study of:

Systemic anatomy is focused on understanding how different organ systems function as integrated wholes within the body. This includes not just the individual components of each system, but also how they work together to maintain homeostasis and support life processes. For instance, when studying the cardiovascular system, one would explore not only the heart and blood vessels but also how these organs interact with other systems such as the respiratory system and the nervous system to circulate blood, deliver oxygen, and remove carbon dioxide.

In contrast, the other options pertain to more specific aspects of anatomy. For example, the study of individual bones is a part of skeletal anatomy, while surface features involve aspects of surface anatomy, which focuses on external structures. Tissue structures pertain to histology, which examines the microscopic organization of tissues. Hence, the emphasis on organ systems in systemic anatomy makes it unique and essential for understanding the interconnectedness of bodily functions.