Which of the following belongs to the chemical level of body organization?

• A. Organs
• B. Atoms
• C. Tissues
• D. Organ systems

Answer: (B)

Verified step by step guidance

1. Step 1: Understand the levels of body organization in Anatomy & Physiology. The body is organized into several hierarchical levels: chemical, cellular, tissue, organ, organ system, and organism levels.
2. Step 2: Focus on the chemical level. This level is the simplest and includes atoms and molecules, which are the building blocks of matter. Atoms combine to form molecules, such as water (H₂O) and proteins, which are essential for cellular function.
3. Step 3: Compare the options provided in the question. Organs, tissues, and organ systems belong to higher levels of organization (tissue level, organ level, and organ system level, respectively). These are composed of cells and molecules but are not part of the chemical level.
4. Step 4: Recognize that atoms are the fundamental units of matter and belong to the chemical level of organization. They form molecules, which are involved in biochemical processes within the body.
5. Step 5: Conclude that the correct answer is 'Atoms,' as they represent the chemical level of body organization, distinct from the higher levels like tissues, organs, and organ systems.