National League for Nursing (NLN PAX) Practice Exam

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Which of these sequences of anatomic organization, from the simplest level to the most complex, is the correct sequence?

From tissue, organ, organ system to organism.
From organ system, organ, tissue to organism.
From tissue, organ system, organ to organism.
From organ, organ system, tissue to organism.

The correct answer is: From tissue, organ, organ system to organism.

The correct sequence from the simplest level to the most complex is tissue, organ, organ system, and then organism. This organization reflects the hierarchical structure in biological systems, where each level builds upon the previous one. Starting with tissues, which are collections of similar cells that work together to perform a specific function, these combine to form organs. Organs are specific structures that carry out particular functions, such as the heart or liver. When multiple organs come together to perform a larger function, they create an organ system, like the circulatory or digestive systems. Finally, when all organ systems work together, they form the organism, which is a complete living entity. This understanding of anatomical organization helps students grasp the complexity of biological systems and the interdependence of their parts, providing a foundational framework for further study in anatomy and physiology.