sperm cell is 85,000 times less than that of the female gamete.
An image would have been helpful here to illustrate the size difference better. The reader may not know the size of a gamete, so hearing that sperm is 85,000 times smaller does not make as big of an impact.
Figure 9.2. Structure of Sperm. Sperm cells are divided into a head, containing DNA; a mid-piece, containing mitochondria; and a tail, providing motility. The acrosome is oval and somewhat flattened. From Betts, et al., 2013. Licensed under CC BY 4.0. [Image description.]
More detail could have been added here, explaining the purpose of each part of the sperm's structure.
Introduction Acknowledgements Thanks and Gratitude I. Main Body 1. Identifying Word Parts in Medical Terms2. Medical Language Rules3. Prefix4. Suffix5. Medical Language Within the Context of Anatomy and Physiology6. Integumentary System7. Respiratory System8. Urinary System9. Male Reproductive System10. Female Reproductive System11. Obstetrics12. Cardiovascular System - Heart13. Cardiovascular System - Blood Vessels and Blood14. Lymphatic and Immune Systems15. Digestive System16. Skeletal System17. Muscular System18. Sensory Systems19. Nervous System20. Endocrine System
Having an interactive and clickable table of contents lets readers easily see the contents of the chapter and quickly skip to the area they want.
Concept Check
I think the Concept Check is a good interactive way for readers to check their progress and how much they have remembered from the chapter, as well as test their new knowledge.
Gametes
The key terms of the chapter being bolded, as well as being able to click and see the definition is incredibly useful. It saves time of looking it up yourself, or taking up more space on the page.
Did You Know?
Having small "Did You Know?" sections is a nice way of keeping readers engaged from long paragraphs of medical terminology.