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Week 2 · Assignment: Traditional alternative (no AI)

Week 2 — Reading the Blood's Narrow Band: A pH and Body-Chemistry Report — Traditional alternative (no AI)

Human Anatomy and Physiology I Free sample edition
Traditional alternative (no AI), unpublished. In the course this is a separate assignment that ships unpublished beside the adaptive assignment: same objective, no AI. An instructor who prefers it publishes it and unpublishes or deletes the adaptive one, as the note at its top says.

Instructors: publish this instead of the adaptive version if you prefer, and unpublish or delete the adaptive one.

Assignment 2 of the term — count pH steps, read a blood value against its range, and put the numbers into plain words for someone new to anatomy and physiology.

This week you learned what identifies an element, how the three bonds differ, why water's polarity gives it four jobs in the body, and how to read the pH scale one tenfold step at a time. Week 1 gave you homeostasis and the normal range; this week you read the blood's pH range the same way. In this assignment you work four short problems, interpret each one, and explain a blood pH value to someone who has never studied anatomy and physiology. This week's lecture tutorial, quiz, discussion, and A&P Lab & Inquiry practise the same ideas from other angles.

The task

This week's shared dataset is Dataset B, the pH step pair: pH 4, pH 5, and pH 7. Blood is held between 7.35 and 7.45, typically 7.4, and a chart value of 7.0 is illustrative. Each whole step on the pH scale multiplies the hydrogen ions by 10, so you count the steps first and then raise ten to that power.

Work these four problems, showing your arithmetic:

  1. Compare pH 5 with pH 7: pH 5 is two whole-unit steps below pH 7, and each step multiplies the hydrogen ions by 10. How many times more hydrogen ions does pH 5 carry than pH 7?
  2. Compare pH 4 with pH 7: pH 4 is three whole-unit steps below pH 7, and each step multiplies the hydrogen ions by 10. How many times more hydrogen ions does pH 4 carry than pH 7?
  3. Blood is typically pH 7.4. An illustrative chart value reads 7.0. By how many pH units is 7.0 below 7.4?
  4. By mass, the body is about 65% oxygen, 18% carbon, 10% hydrogen, and 3% nitrogen. What percent of body mass do these four elements make up together?

Beside each answer, add one brief interpretation:

  • Problem 1: classify pH 5 as acidic, neutral, or basic, and explain why two steps give a result found by multiplying the tens rather than adding them.
  • Problem 2: say which value carries more hydrogen ions and why, and explain why calling pH 4 "three times more acidic" reads the scale like a ruler.
  • Problem 3: name the side of the blood's range that 7.0 falls on, and explain why this course describes a drop of a fraction of a unit in words instead of turning it into a fold figure.
  • Problem 4: say what identifies each of the four elements, and link one of water's four jobs (solvent, heat sink, lubricant, reactant) to water's polarity.

Explain it to a non-expert

An older relative reads the illustrative 7.0 chart value beside a band of 7.35 to 7.45 and says, "It's only a little lower than 7.4, so it hardly matters." Write a 3–5 sentence message that explains what pH measures, why each whole step is a tenfold change, and why this course treats a drop from 7.4 to 7.0 as a meaningful rise in hydrogen ions. Name one limit, for example that the value is an illustration and this message is not about anyone's health. Put any technical term in everyday words. More than one good message is possible.

For a different, ungraded example, imagine a friend who asks why a knee can bend smoothly thousands of times. Model answer: "Between the moving bones of a joint sits a slippery fluid that is mostly water. Water molecules are lopsided in charge and slide easily past each other and past surfaces, so the fluid lets the ends of the bones glide instead of grinding. That is water working as a lubricant, one of its four jobs in the body. It explains the smooth motion, but it does not tell you anything about why a particular knee might hurt."

Use that pattern for the blood-pH message, with your own wording and evidence.

Show your arithmetic. A reader should be able to rebuild every number you report from the values given, without guessing which steps you counted or which values you used.

Deliverables

Submit a single report containing:

  • the four answers, each with the arithmetic shown and the brief interpretation the task names for that problem;
  • your message to your relative, explaining what pH measures, why each step is tenfold, why the drop from 7.4 to 7.0 is a meaningful rise in hydrogen ions, and one limit; and
  • a one-line restatement of the values you used, so your results are reproducible.

Keep it to roughly one page.

Choose how you show it. Present your report as written text, or as a recorded audio or video explanation of about three minutes with a transcript, or as a labeled sketch of the pH scale with a short note. Every form is graded by the same scoring criteria. Submit in any accessible file type or as a link; a recorded response may be submitted as audio or video with a transcript, or as text.

How you'll be graded

The full analytic rubric is attached to this assignment in Canvas.

Academic integrity and AI use

This version is designed to be completed without AI: do the computations, the interpretations, and the writing yourself, without a chatbot or other AI tool. You may use a calculator or a spreadsheet for the arithmetic. Submitting AI-generated work as your own, or copying another student's work, is an integrity violation under the course policy.

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