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Week 1 · Module overview

Week 1 — Body Organization, Homeostasis & Anatomical Terminology

Human Anatomy and Physiology I Free sample edition

Why this matters

A nursing student charting a temperature and a paramedic radioing where an injury sits both speak this week's two languages: how the body holds itself steady, and a shared map of the body.

In plain language

This course studies the human body two ways at once: what each part is and where it sits, and how that part works to keep you alive. The first tool this week is homeostasis (the body keeping its inside steady while the outside keeps changing), run by small loops that sense a change and push back against it. The second tool is a shared map of the body, starting from one standard pose, the anatomical position (standing upright, palms facing forward). Direction words, cutting planes, and body spaces then let two people point to the same spot without confusion. By the end of the week you can read a temperature chart as a loop and describe any spot on the body so that someone else finds it.

  • This week: anatomy versus physiology, what life does and needs, the levels of organization, feedback loops, and the language of position, direction, planes, and cavities.
  • How they connect: this chapter is the foundation; every later week uses the loop and the map.
  • Where we're going next: Week 2, The Chemistry of Life, starts at the chemical level.

Focus

How does the body hold itself steady, and how do we name any spot on it without confusion?

By the end of this module, you should be able to:

  • [ ] trace a feedback loop through its receptor, control center, and effector
  • [ ] compute a reading's gap from the set point and tell negative from positive feedback
  • [ ] describe a location from the anatomical position with the directional pairs
  • [ ] name the body planes and the cavities on each side of the diaphragm

To-do

Plan your week

  1. Read Chapter 1 (about 45 minutes), then the lecture and slides.
  2. Work the lecture tutorial (60–90 minutes) and the practice set (about 20 minutes).
  3. Run the A&P Lab & Inquiry (about 2 hours), then the discussion and the assignment.
  4. Take the quiz.

This week's checkpoint: name the three parts of a feedback loop in order, and say from the anatomical position why the thumb is lateral.

You've got this

Take it in order, and ask your instructor if a step snags.

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