Week 7 — Count It, Name It, Order It: A Bone Key Report — Traditional alternative (no AI)

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

Assignment 7 of the term — count the bone key's lists, name every member, put a long bone's regions in order, and explain to someone new why bone keeps rebuilding.

This week you learned that bone is a living tissue with six jobs, how bones sort by shape, how a long bone reads from end to end and from the outside in, how compact and spongy bone differ, what the four bone cells do, how bone forms, grows, and remodels, and how the calcium loop runs. Week 1 gave you the feedback loop's three parts, and Week 5 put bone and cartilage in the supportive connective tissue family; this week you open bone itself. In this assignment you work four short counting problems, interpret each one, and explain remodeling 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 the bone key: canonical counts and orders, with no measured data. The skeletal system has 6 jobs; bones sort into 5 shape classes; bone has 4 cell types; bone forms by 2 ossification routes; and the calcium loop runs on 3 parts. A long bone reads epiphysis → metaphysis → diaphysis → metaphysis → epiphysis, and a cut across its shaft reads periosteum → compact bone → endosteum → medullary cavity.

Work these four problems, showing your arithmetic:

1. The skeletal system's jobs split into 3 you can feel in an ordinary day (support, movement, protection) and 3 quieter ones. How many jobs does the skeletal system have in all?
2. Reading a long bone end to end, you pass 2 epiphyses, 2 metaphyses, and 1 diaphysis. How many regions do you name in all?
3. The bone key lists 4 bone cells, and 1 of them resorbs bone. How many of the bone cells do not resorb bone?
4. The bone key counts 6 functions, 5 shape classes, 4 bone cells, 2 ossification routes, and 3 loop parts. How many items does the key hold in all?

Beside each answer, add one brief interpretation:

• Problem 1: name the three quieter jobs, and say which marrow does each marrow job.
• Problem 2: list the regions in order from one end to the other, and say what each metaphysis holds in a child and in an adult.
• Problem 3: name the cell that resorbs bone, and give the job of each of the other three.
• Problem 4: name the hormone that raises blood calcium and the one that lowers it, say what each does to osteoclasts, and explain why the calcium loop is negative feedback.

Explain it to a non-expert

A relative who follows space news asks, "Why do astronauts have to rebuild bone after a long mission? Aren't bones fixed once you're grown?" Write a 3–5 sentence message that explains, in everyday words, that bone is a living tissue, what remodeling is and which two cells do it, and how less load in space leads to bone loss. Name one limit, for example that the rate of loss is an estimate taught in words, or that this message is about how bone works and 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 long bone has a hollow middle. Model answer: "Picture a bone's shaft as a strong tube rather than a solid rod. The wall of the tube is dense bone, and the hollow center, called the medullary cavity, holds yellow marrow, a fatty tissue the body uses to store energy. So the hollow is not wasted space; it is a storage room inside the frame. This is a simplified classroom picture, and it does not cover the spongy bone at the bone's two ends."

Use that pattern for the message to your relative, with your own wording and evidence.

Show your arithmetic. A reader should be able to rebuild every count you report from the numbers given, without guessing which numbers you used or which operation you chose.

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 that bone is a living tissue, what remodeling is and which two cells do it, how less load in space leads to bone loss, and one limit; and
• a one-line restatement of the counts 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 a long bone end to end and in cross-section 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 counts, 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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