From cells to organisms
10 videos
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Biology - From Cells to Organisms: The Big Picture
Learn how 37 trillion cells build your body through tissues, organs, and systems, and how homeostasis keeps everything balanced through negative feedback loops.
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Biology - Cell Theory: The Three Rules of Life
Learn the three fundamental rules of cell theory: all living things are made of cells, cells are the basic unit of life, and all cells come from pre-existing cells.
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Biology - Prokaryotic vs. Eukaryotic Cells
This video explains the key differences between prokaryotic and eukaryotic cells, focusing on size, DNA structure, and the presence of membrane-bound organelles.
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Biology - Eukaryotic Organelles: A Tour of the Cell
A tour of cell organelles explaining their functions, including the nucleus, ER, Golgi, mitochondria, and differences between plant and animal cells.
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Biology - Identifying Cell Structures: Practice Walkthrough
Learn to identify prokaryotic vs. eukaryotic cells by examining key features like nucleus, organelles, and structure. Includes practice examples to master cell identification.
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Biology - Stem Cells and Differentiation
Learn how stem cells differentiate from totipotent to specialized cells, and how gene activation creates over 200 cell types from one fertilized egg.
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Biology - Levels of Organization: Cells to Organ Systems
This video explains the biological hierarchy from cells to organisms, showing how 37 trillion cells organize into tissues, organs, and systems to build the human body.
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Biology - How Organ Systems Work Together
Learn how body systems work together to keep cells alive, from oxygen delivery to waste removal. Discover the interconnected roles of respiratory, circulatory, and other systems.
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Biology - Homeostasis and Feedback Loops
This video explains homeostasis and feedback loops, covering negative feedback (like thermoregulation) that maintains stability and positive feedback (like childbirth) that amplifies change.
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Biology - Feedback Loops: Practice Problem Walkthrough
Learn how negative and positive feedback loops work in the body through real-world examples like blood sugar regulation, fruit ripening, and water balance.