Gr 1–4—Straightforward, basic introductions to various body systems that pair text pages with related photos or diagrams. Each volume offers essential information without complexity or confusion. For example,
Heart explains and illustrates the blood flow within the four chambers but avoids mention of the more tricky concept of valves.
Stomach has a diagram of the whole digestive system but mainly concentrates on the title organ.
Lungs places the most emphasis on terminology in the series and includes a detailed diagram of an alveolus.
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