Nursing Entrance Exam (NEX) Practice Exam 2025 - Free NEX Practice Questions and Study Guide

The structure and function of major organ systems, such as the circulatory and respiratory systems, is directly related to human anatomy. Understanding human anatomy involves examining the physical structures of the body, including organs, tissues, and systems, and how they work together to support overall bodily functions. The circulatory system is responsible for transporting blood, nutrients, and oxygen throughout the body, while the respiratory system facilitates the exchange of gases, allowing for respiration and the supply of oxygen to tissues. This knowledge is foundational for nursing and healthcare, where a thorough understanding of anatomical structures is essential for patient care and medical practice.

The other concepts listed do not specifically relate to human anatomy. For instance, photosynthesis pertains to plant biology and energy conversion processes, classifications of living organisms refer to taxonomy, and principles of genetics focus on heredity and genetic variations rather than the anatomical structures of humans. Thus, option B is the one that directly connects to the study of human anatomy.