BIOL 21: Cellular Biology

Discover the relationship between the papillary layer of the dermis and the layers of the epidermis. Understand the structure, function, and connections that exist in our skin's anatomy.

Explore the definitions of tissue, organ, and organ system. Understand the distinctions and interconnectedness between these components. Get an overview of the human body's eleven major organ systems and their functions.

Explore how viruses replicate and the various ways in which new viruses emerge. Understand the importance of mutation, cross-species transmission, and the significance of wider spread in host species for disease control strategies.

Unpack the intricate process of photosynthesis, revealing the two major stages within chloroplasts. Discover the vital roles of ATP and NADPH in the Calvin Cycle. Grasp the essence of how plants fuel life on Earth.

Uncover the microscopic intricacies of compact and spongy bone structures. Learn about osteons, trabeculae, and the vital role of osteocytes. Dive into the balance of strength and functionality bones provide to our body.

Unveil the essential muscles that make breathing possible in this video. Learn why the diaphragm and scalene are crucial players and why other muscles like the trapezius and semispinalis aren't involved in respiration.