Drug effects on signaling
Thu, Mar 18, 2027 · Week 9 · Human Anatomy & Physiology (Human Body Systems)
Today's goal: Analyze your reaction-time data and explain how drugs alter neural signaling with a CER.
This is a model of the work you should turn in today. Use it to check your own: match the structure and the level of detail, do not copy it. Your data and wording should be your own.
Bar graph: two bars, warm-hand condition 195 ms and cold-hand condition 248 ms, y-axis labeled "Reflex latency (ms)," x-axis labeled "Hand temperature."\n\nClaim: Cooling the skin and nerves of the hand would lengthen the withdrawal-reflex latency compared to a warm hand.\n\nEvidence: In our data, the average time from touch to finger pull-back rose from 195 ms with a warm hand to 248 ms with a cold hand, a slowdown of about 53 ms.\n\nReasoning: A reflex signal has to travel along sensory and motor neurons and cross synapses, and anything that slows that pathway lengthens the measured latency. Cooling does this physically, because lower temperature slows the ion movement and membrane processes that drive each action potential, so the impulse travels more slowly down the axon. That is why cooling by a few degrees added about 53 ms to the reflex, the same direction that any change slowing conduction would push. Warming the pathway would do the opposite, speeding conduction and shortening the latency back toward or below the warm baseline.
This model shows the level of evidence and organization needed to complete: A labeled bar graph comparing two average nerve-signal timing conditions with units, plus a Claim-Evidence-Reasoning paragraph explaining how a physical change to the signaling pathway shifts the pattern through a conduction mechanism.
- Write one defensible claim.
- Choose specific evidence that supports the claim.
- Explain the scientific rule that connects the evidence to the claim.
Keep the structure. Replace the question, facts, measurements, and evidence. Then recheck units, vocabulary, and whether the conclusion goes beyond the evidence.
Also due today: Submit graph and CER as a single combined document.
Turn in: Worked CER on a parallel case
Go to Schoology to turn this in.
Submit one PDF. Put your first and last name in the document header. Name the file: FirstName LastName - Assignment Title - YYYY-MM-DD.pdf.
Open Schoology PDF upload helpIf you cannot get in, see Mr. Mendoza. Do not skip the work.
Claim ceiling: Today's evidence supports a classroom claim about drug effects on signaling. It cannot prove causation, diagnose a real patient, or justify action outside this room.
One exam-style question that uses exactly what you practiced today. Try it before you reveal the answer, then read why each choice is right or wrong.
Tap an answer to see the full explanation. Nothing is recorded or graded.
It builds this reusable test skill: Explaining how stimulants and depressants alter synaptic signaling and reaction time.
- Name the concept or data pattern being tested.
- Cross out choices that violate that rule or the evidence.
- Justify the best remaining choice before checking the answer.