Course: Anatomy & Physiology I (BIOL 2301 + BIOL 2101) · Silver Oak University (fictional sample) · Prof. Navarro
Module: Week 2 of 16 · Fall 2026 · in-person, two 75-minute lectures + one weekly lab
Objective covered: Objective 2 — Explain the chemistry that underlies human physiology: atoms and chemical bonds, the properties of water, pH/acids/bases/buffers (quantitative), and the four classes of biomolecules.

This file holds two pieces: (A) the Module 2 Overview page ("Start Here") and (B) the Welcome Announcement that drips out when the module opens. Dates below assume a Tuesday/Thursday lecture pattern with Week 2 meeting Tue Sep 8 and Thu Sep 10, a lab that same week, and end-of-week work due Sunday Sep 13, 11:59 p.m. Adjust the day-of-week and times to match your section. (Labor Day is Mon Sep 7 — no class that day.)

(A) Module 2 Overview — Start Here

Welcome to Week 2: The Chemistry Your Body Runs On

This is your home base for the week. Read it first, then work the checklist below from top to bottom. Everything you need is linked inside the module.

Last week we built the body's address system and met the idea the whole course rests on — homeostasis. This week we go all the way down to the chemical level on the organization ladder, because every structure you'll name and every function you'll explain runs on chemistry. We'll meet atoms and the bonds that join them, the strange and wonderful properties of water, and the four families of biomolecules your body is built from. And we'll do our first quantitative pocket: pH. Your blood holds a nearly constant pH around 7.4, and drifting even a few tenths is dangerous — so this week is also a homeostasis story, told in chemistry.

The week's big question

"What is the body made of, chemically — and how does it keep its chemistry, especially its pH, steady enough for cells to survive?"

By Friday you'll classify chemical bonds, explain water's properties from its polarity, read the pH scale and compute how many times more acidic one pH is than another, explain how buffers defend blood pH near 7.4, and match each biomolecule to its building block.

By the end of this week, you can…

Use this as a checklist. If you can do all four out loud, you're ready for the quiz.

• [ ] Describe an atom (protons/neutrons/electrons; protons define the element) and classify chemical bonds — ionic (electrons transferred) vs. covalent (electrons shared; polar vs. nonpolar) vs. hydrogen bonds (weak attractions between molecules).
• [ ] Explain water's key properties from its polarity — cohesion/surface tension, the "universal solvent," high heat capacity (temperature buffering), and water as a participant in reactions.
• [ ] Use the pH scale (0–14; lower = more H⁺ = more acidic; higher = fewer H⁺ = more basic; 7 = neutral) and do the arithmetic: each whole unit = 10× change in H⁺, so pH 4 vs pH 7 = 1000× more acidic. Explain buffers and why blood pH ≈ 7.35–7.45 (acidosis < 7.35; alkalosis > 7.45).
• [ ] Match the four biomolecules to their monomers — carbohydrate → monosaccharide, protein → amino acid, nucleic acid → nucleotide, lipid → (no single monomer; fatty acids + glycerol) — and explain that a protein's function follows its shape.

What's due this week, and when

Work these in order — each one gets you ready for the next.

Heads-up on the AI tools: you'll use a chatbot to draft and explain, and then you judge its work against what we cover in class. Chatbots routinely miscompute pH ("pH 4 is 3× more acidic than pH 7" — it's 1000×), mislabel a biomolecule's monomer, or call a higher pH "more acidic." Catching the model is the point — in the tutorial, the assignment, and the lab.

Late policy reminder: 10% off per day late. If life happens, reach out before the deadline — I'd much rather hear from you early.

How to succeed this week

• Lead with the idea, not the jargon. Every term this week is a plain-English idea first (polar just means "lopsided charge"; a buffer just means "a chemical that soaks up or releases H⁺ to hold pH steady"). The vocabulary comes after the picture clicks.
• Memorize two tiny hooks. "Each pH unit is a 10× step — count the units, then raise 10 to that power." And "Lower pH = more H⁺ = more acidic; higher pH = fewer H⁺ = more basic."
• Do the pH arithmetic the same way every time. Count the whole units between the two pH values, then multiply by 10 for each unit (or raise 10 to that power). pH 4 to pH 7 is 3 units → 10×10×10 → 1000×. Never subtract.
• Tie every property of water back to one fact: polarity. Cohesion, solvent power, and heat capacity all come from water's lopsided charge.
• Treat the chatbot as a smart intern, not an oracle. It drafts; you check. This week the easiest catch is the pH fold-change — models love to say "3 times" when the truth is "1000 times."

You'll use a little arithmetic this week, but nothing beyond multiplying by 10 — come ready to count pH units and reason about your own body's chemistry. See you Tuesday.

(B) Welcome Announcement — Module 2

Release setting: post on the module's start day (offset = 0 days), i.e., Tue Sep 8, 2026 — not before. If your platform won't preserve the scheduled date on import, post this as a draft labeled "Release: Tue Sep 8."

Subject: Welcome to Week 2 — is pH 4 three times or a thousand times more acidic than pH 7? 🧪

Hi everyone — great start last week, and welcome to Week 2!

Quick warm-up: pH 4 versus pH 7 — how much more acidic is that, exactly? Most people say "three times" (7 minus 4). The real answer is 1000 times, because the pH scale moves by a factor of 10 at every single step, and there are three steps between 4 and 7: 10 × 10 × 10. That gap between intuition and the truth is our way in this week: this is the course's first quantitative pocket, and getting pH right matters — in the body, and on a chart.

This week — The Chemistry of Life — we tackle the big question: What is the body made of, chemically, and how does it keep its chemistry steady enough for cells to live? By Friday you'll classify chemical bonds, explain why water behaves the way it does, compute pH fold-changes, and explain how buffers hold your blood near pH 7.4 — which is just homeostasis again, in chemistry.

Three things not to miss:
1. Lecture Tutorial 2 — work through atoms, bonds, water, pH, buffers, and the biomolecules with one approved chatbot (Gemini, Claude, or ChatGPT) and submit the share link. You'll catch the model's pH mistakes, not just trust it. Due Sun Sep 13.
2. Lab 2 ("Measuring Acidity"), Quiz 2, Discussion 2, and Assignment 2 also close Sun Sep 13 — the lab uses the free PhET pH Scale simulation, so bring a calculator and start early.
3. Open the Start Here page first — it lays out everything in order with due dates.

One promise: this is a course about how the body is built and how it works — and this week shows you the chemistry underneath all of it. Lead with the plain-language idea, keep "each pH unit is a 10× step" in your head, and you'll be in great shape. (Note: Monday is Labor Day — no class — so our first meeting is Tuesday Sep 8.)

Bring your curiosity (and a calculator) on Tuesday.

See you soon,
Prof. Navarro