Pacing Guides

Five schedules follow, for the five formats this book is actually adopted into. Each is a real plan rather than an even division of 28 by the number of weeks — an even division is what produces a course that spends as long on skin as on the nephron and then wonders why the class fails the renal exam.

Take any of these and change it. They are starting points with the hard decisions already made and stated out loud, which is the slow part.

Before you build a schedule: three numbers

1 · There is more book than there are hours. The difficulty index at the end of this page estimates the class hours each chapter genuinely needs. The total is 113 lecture hours. A standard two-semester, three-credit lecture sequence gives you about 90. You are 23 hours short before you start, which means every workable schedule is a set of deliberate cuts. The guides below make those cuts explicitly so you can argue with them.

2 · Reading load is the constraint students actually hit. Chapters run 10,000–15,000 words. Plan with these figures:

A two-chapter week costs a student more than the 6–9 hours per week a three-credit course is nominally entitled to, once the Review sections and the Case File entry are counted. Two-chapter weeks are sometimes unavoidable. Three in a row is a mistake you will pay for on the next exam.

3 · The lecture-to-active-learning ratio matters more as the format compresses. Most instructors get this backwards under time pressure: the tighter the schedule, the more of the remaining class time should be active, because the exposition is already in the book and supervised reasoning practice is not. Recommended splits appear with each guide.

The two conceptual walls

Two places in this book reliably stop a class. Every schedule below is built around them, and if you take nothing else from this page, take their placement.

Wall 1 · Excitation–contraction coupling (Chapter 9, §9.4–8.6). Action potential → T-tubule → dihydropyridine receptor → ryanodine receptor → calcium release → troponin → cross-bridge cycle → ATP hydrolysis → detachment → SERCA reuptake. It is eight coupled steps in which every step is a prerequisite for the next, it is the first genuinely mechanistic content in the course, and it is where students who have been passing by memorization discover that memorization has stopped working. Some of them conclude they are bad at science. Say out loud, in advance, that this chapter is the hardest thing so far and that struggling with it is the normal experience — that single sentence measurably reduces withdrawals.

Wall 2 · The countercurrent multiplier (Chapter 26, §26.5–22.6). The loop of Henle generates a medullary osmotic gradient it also depends on, which is a circular explanation until the student sees that the multiplication is a time-course, not a steady state. It is the only place in a first-year course that requires holding a self-reinforcing loop in mind, and it lands late in the second semester when students are tired.

Placement rules that work:

• Never put a wall in the same week as an exam. Students triage, and they triage away from the thing that is hard and toward the thing that is graded on Friday.
• Give each wall a full week with no competing chapter, and put the exam that covers it at least one week later.
• Never put a wall in the last two weeks of a term.
• Both walls reward the same intervention: build them once, slowly, at the board, forwards; then have students rebuild them backwards from a consequence ("the patient's serum calcium is high — walk back up the chain"). Backwards is where you find out whether they have it.

  WHERE THE TWO WALLS FALL IN EACH FORMAT
  ═══════════════════════════════════════════════════════════════════════════

  FORMAT                    │ WALL 1 (Ch 8, E-C coupling) │ WALL 2 (Ch 22, countercurrent)
  ──────────────────────────┼─────────────────────────────┼──────────────────────────────
  2-semester (15 + 15)      │ S1 wk 8–9   ██ full 2 weeks │ S2 wk 11–12  ██ full 2 weeks
  2-quarter (10 + 10)       │ Q1 wk 6–7   ██ 1.5 weeks    │ Q2 wk 7–8    ██ 1.5 weeks
  1-semester survey (16)    │    wk 7     ██ 1 week       │    wk 16     ▓  SURFACE ONLY
  Accelerated (10)          │    ─ omitted / assigned ─   │    wk 9      ██ 1 week
  Summer intensive (6)      │    wk 2     ▒  2 days       │    wk 5      ▒  2 days
  ──────────────────────────┴─────────────────────────────┴──────────────────────────────
   ██ taught fully   ▓ concept only, no mechanism   ▒ compressed, expect attrition

   RULE: exam covering a wall sits ≥1 week AFTER the wall week.
         Wall week contains no second chapter and no exam.

Guide 1 · Two semesters, 15 weeks each — the standard majors sequence

The default. Three lecture hours and one three-hour lab per week, Chapters 1–16 in Semester 1 and 15–28 in Semester 2. Four exams per semester including the final.

Lecture : active learning — 60 : 40. In a 50-minute period that is roughly 30 minutes of exposition in two blocks with a 5-minute retrieval or prediction task between them, and a closing 10 minutes of application — a Case File prompt, a "predict the consequence" item, or two Level 3 review questions worked in pairs.

Semester 1 · Chapters 1–16

Exam placement rationale. Exam 1 after Chapter 4 catches the students still treating this as a memorization course while intervention is possible; returning it with a study-method conversation in week 5 is the highest-value fifteen minutes in the semester. Exam 2 covers the light musculoskeletal material and sits during the first hard week so Chapter 9 has two clean weeks after it. Exam 3 lands a full week after Wall 1 ends.

Where students historically struggle in this format.

• Chapter 9 — Wall 1. Two weeks, no competing content, and the exam a week later. See above.
• Chapter 16 (endocrine) — it arrives in the last week, when students are exhausted, and carries the heaviest memorization load in Semester 1 (roughly forty hormones with source, target, trigger, and effect) while being load-bearing for Chapters 24–28. The fix is one structural table — hormone / gland / stimulus / target / action / feedback loop — built collaboratively in class rather than delivered, with Appendix F as the reference. Teach three axes completely (thyroid, adrenal, calcium) and let the rest be table work.
• Chapter 4 (tissues) — the difficulty is perceptual, not conceptual. Students can recite the classification and cannot recognize a slide. This is a lab problem with a lab solution; see Laboratory Alignment.

Semester 2 · Chapters 17–33

Where students historically struggle in this format.

• Chapter 26 — Wall 2, discussed above. Two weeks; exam a week later; teach filtration and reabsorption completely before you touch the loop.
• Chapter 22 §22.7 (the oxyhemoglobin dissociation curve) — students memorize "right shift means unloading" without seeing that the curve's shape is the mechanism. Ask what would happen if it were a straight line; half the class discovers cooperativity on their own.
• Chapter 20 (immunity) — the vocabulary load is enormous and the conceptual core is small. Teach four things properly (innate versus adaptive; antigen presentation; clonal selection; the memory response) and hang everything else off them. Students drown here because they treat two hundred terms as equally important and nobody tells them otherwise.

Guide 2 · Two quarters, 10 weeks each

Same content, two-thirds the time. The honest statement of what happens: a quarter system does not compress a semester course, it deletes about a third of it. Decide what you are deleting or the last three weeks will decide for you.

What gets compressed (taught, but at lower resolution): Chapter 2 to the sections that Chapter 3 needs; Chapters 6 and 7 into one week with joint classification reduced to a table; Chapter 10 to naming logic plus the muscles your lab practical actually tests; Chapters 13 and 15 into one week; Chapters 27–30 into one week and a half.

What gets cut (assigned as reading, not on the exam): most Development sidebars; every Advanced Topic section; Chapter 15's chemical senses; Chapter 23's enzymology; Chapter 29 beyond pedigrees and polygenic risk.

Lecture : active learning — 55 : 45. Counterintuitive under time pressure, and correct. The lecture content is in the book; the reasoning practice is not.

Quarter 1 · Chapters 1–16

Quarter 2 · Chapters 17–33

The three chapters students most reliably struggle with in this format: Chapter 9 (Wall 1, now with only a week and a half); Chapter 26 (Wall 2, same); and — specific to the quarter system — Chapter 16, because endocrine falls in the final week of Quarter 1 and is then assumed by Chapters 24–28 in a quarter the student has not started yet. If your program allows it, move Chapter 16 to Quarter 2 week 1 and open the second quarter with hormones. It costs Quarter 1 nothing and it repairs the worst seam in the sequence.

Guide 3 · One-semester survey, 16 weeks

For non-majors, dental hygiene, health science, and pre-nursing preparation courses. Built on the Core 16 from Learning Paths: Chapters 1, 3, 4, 5, 6, 7, 9, 11, 12, 16, 17, 18, 19, 22, 23, 26. The goal is a durable mental model, not comprehensive nomenclature — and the single most common way this course fails is that the instructor, trained on the majors sequence, teaches a thinner version of it instead of a different one.

Teach mechanism; cut nomenclature ruthlessly. A survey student who can explain why a diuretic lowers blood pressure but cannot name the sartorius has learned the more valuable thing.

Lecture : active learning — 50 : 50.

Swap-ins if your syllabus has room or names them: Chapter 20 for week 15 in a pre-nursing section; Chapter 27 for dental hygiene and general education; Chapter 31 for week 16 if students continue into nursing — in which case teach 22 and 27 as one unit at survey depth.

The three chapters students most reliably struggle with in this format: Chapter 9, which gets one week and needs two — teach the cross-bridge cycle and the calcium switch, and let the molecular detail of the T-tubule–SR junction go. Chapter 16, because survey students have no prior framework for chemical signaling — build the generic axis (hypothalamus → pituitary → gland → hormone → target → negative feedback) once and reuse it three times rather than teaching three separate axes. And Chapter 4, for the same perceptual reason as always.

Wall 2 is not taught in this format. State the medullary gradient as a fact, show that ADH opens water channels in the collecting duct, and let students explain why concentrated urine is possible without deriving how the gradient is built. This is the right call at survey depth and you should not feel bad about it.

Guide 4 · Accelerated allied health / EMT–paramedic, 10 weeks

For programs where A&P is a gateway module inside a larger certificate: EMT and paramedic, respiratory therapy, surgical technology, medical assisting, and accelerated practical nursing. Uses the accelerated order from Learning Paths: 1 → 3 → 4 → 10 → 11/12 → 15 → 16 → 17 → 19 → 22 → 27 → 28.

The organizing principle is perfusion. Prehospital and acute care is airway, breathing, circulation, perfusion, and neurologic status, and this sequence front-loads exactly the physiology that explains why each of those fails.

Lecture : active learning — 45 : 55. These students are motivated by cases and bored by taxonomy. Run a scenario every session.

Supporting chapters, assigned as reading modules with short quizzes rather than lecture: 5 (burns, rule of nines), 6–7 (fractures, immobilization), 8–9 (compartment syndrome, crush injury), 14 §16.4 and §16.6 (adrenal, pancreas), 18 (sepsis, anaphylaxis), 20 (abdominal quadrants, GI bleeding).

The three chapters students most reliably struggle with in this format: Chapter 26, which is Wall 2 in a single week — teach GFR as a pressure problem first, since these students already understand perfusion, and the nephron becomes an application of something they own. Chapter 31, because it arrives last and is the whole point — protect it, and consider running it as a two-session workshop with real gas values rather than as lecture. And Chapter 11, which surprises people: accelerated students expect anatomy and get electrochemistry in week 3. Warn them, and anchor every step to a drug or a finding — lidocaine blocks sodium channels, hyperkalemia depolarizes the resting membrane, hypocalcemia lowers the threshold.

Chapter 9 is deliberately omitted from class time. Excitation–contraction coupling is assigned reading and appears on no exam. This is the cut that buys the schedule, and it is the right one for this audience: cardiac excitation–contraction coupling gets taught properly in Chapter 18 where it matters to them.

Guide 5 · Summer intensive, 6 weeks, two-semester content

Some programs run the full two-semester sequence as one six-week block — typically four hours of lecture and four of lab per day, five days a week. People do complete it. Here is the schedule, and then the warning, which your students should get in writing on day one.

Lecture : active learning — 50 : 50, with mandatory movement. Four-hour blocks fail as lecture regardless of quality. Structure every block as 25 minutes exposition, 10 minutes retrieval or application, repeat, with a real break each hour.

Chapter difficulty and time index

Ratings are 1 (light) to 5 (severe). Conceptual difficulty is how much mechanism a student must hold at once; memorization load is sheer volume of names, values, and lists; hours is lecture contact time to teach the chapter properly, not to survey it. Totals assume a three-credit lecture with a separate lab.

How to read the gap. You are 23 hours short. The cheapest hours to recover: Chapters 7 and 10, by moving nomenclature to lab and drill (~5 h); Chapters 23 and 27–30 at survey depth (~6 h); Chapter 15 without the chemical senses (~2 h); Chapter 2 cut to what Chapter 3 needs (~1.5 h); Chapter 12 taught by region rather than by nucleus (~2 h). That is roughly 16. The remaining 7 come out of review sessions, which is fine — or out of Chapters 9, 26, and 31, which is not.

Next: Laboratory Alignment — the lab sequence mapped to chapters, with low-cost and no-dissection alternatives.