Week 3 — Readings & Resources

Human Anatomy and Physiology I Free sample edition

Your primary reading is Chapter 3 (in this module). Everything below is the optional, go-deeper layer — pick what helps, skip the rest.

How to use this page

This page has 10 items (4 readings and 6 videos). Allow 58–69 minutes for everything. Each group points back to the matching chapter section and class-session segment, so use the full menu when you want more, or take the quick path below.

Every video here has captions: turn them on with the CC button in the player. The chapter covers the same ideas in text.

Pick-one quick path (20–22 min total)

① Reading the border and the parts inside

Chapter 3, Section “Tour the organelles: structure to function” · Session 1, Segment 2, “The organelles: one job each” · Remember: the bilayer keeps heads out and tails in, and each organelle has one job you can name with one verb.

Cell Membrane (Plasma Membrane) — National Human Genome Research Institute Talking Glossary — a short glossary entry, with an optional audio narration, describing the membrane as a double layer of lipids that decides what moves in and out; as you read, picture which part of each lipid faces the water. This builds on Week 2's work with polar and nonpolar molecules. (reading, 3–5 min)
What is a cell? — MedlinePlus Genetics — a plain-language page from the U.S. National Library of Medicine that walks through the cell's parts one heading at a time; match each part it describes to the one-verb job in the chapter, and skip peroxisomes, which this course does not use. Use it while working through the Week-3 module overview. (reading, 5–8 min)
Eukaryopolis - The City of Animal Cells: Crash Course Biology #4 — CrashCourse — a fast, joke-filled tour that pictures an animal cell as a city with a job for every building; listen for builds, ships, and powers, and stop here before how the mitochondrion actually makes ATP; next week takes that up. (video, 12 min) (captions: creator)

② Which way the water goes

Chapter 3, Section “Read tonicity from the cell's side: compare, name, point the water” · Session 2, Segment 4, “Tonicity: compare, name, point the water” · Remember: compare the bath to the cell, name the bath, then let water follow solute.

In Da Club - Membranes & Transport: Crash Course Biology #5 — CrashCourse — a lively episode that runs from diffusion and osmosis through channel proteins to the sodium-potassium pump and vesicles; as you watch, sort each kind of traffic into downhill and free, uphill and paid, or carried in a vesicle. (video, 12 min) (captions: creator)
Facilitated Diffusion Explained — BioMan Biology — a short animated explainer on why some substances need a protein to cross the bilayer even though they still move from high to low concentration; listen for the door-not-motor idea. (video, 3 min) (captions: automatic)
Tonicity — Dr Matt & Dr Mike — a whiteboard walk through hypotonic, isotonic, and hypertonic solutions and what each does to a cell; check every case against the chapter's three moves and make sure each name describes the bath, read from the cell's side. (video, 5 min) (captions: automatic)

③ Paying to go uphill and moving in bulk

Chapter 3, Section “Pay to go uphill: active transport and the sodium-potassium pump” · Session 2, Segment 5, “Uphill traffic: the sodium-potassium pump” · Remember: active transport runs against the gradient and costs ATP, and big loads ride in vesicles.

2-Minute Neuroscience: Sodium-Potassium Pump — Neuroscientifically Challenged — a two-minute animation of the pump at work; say the ions and their directions aloud as it plays, sodium out and potassium in, and treat its nerve-signal ending as a preview of a later week. (video, 2 min) (captions: creator)
Molecule of the Month: Sodium-Potassium Pump — RCSB Protein Data Bank PDB-101 — a short illustrated feature from a research data bank on the pump as a membrane protein that spends ATP to move ions against their gradients; read the opening sections on how the pump works and skip the closing section on drugs. (reading, 6–9 min)
Cell Transport - Endocytosis, Exocytosis, Phagocytosis, and Pinocytosis — The Organic Chemistry Tutor — a board-work tutorial on bringing material in and sending it out in vesicles; pause after each term and say whether the load is going in or out, and treat its receptor-mediated example as more than this course needs. (video, 5 min) (captions: automatic)

Optional one-stop reference (free online reference)

Cell Function — SEER Training Modules, National Cancer Institute — the course's free online anatomy reference, open at its page on how cells work; read the section on movement of substances across the cell membrane, skip filtration, and stop before the section on cell division, which this course does not cover. (reading, 5–8 min)

Heads-up (links rot): these point to outside sites that occasionally move or rename pages. If a link ever fails, tell your instructor and use the reference above in the meantime.

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