4 mistakes learners make with homeostasis, each one named and explained.
Every control in the body is a loop: something detects the change, something coordinates, and something acts.
You answer that you shiver and your hairs stand up, and stop there.
The question looks like it is asking what happens, and those are the things that happen.
Question. Why does shivering help when you are cold?
A common answer. it is just what the body does when it is cold
The answer. muscles contracting rapidly release heat from respiration
Why. A response only earns the mark when you say what it does to the thing being controlled.
Finish every response with the words so that, then say what it changes.
You say a high temperature is dangerous without mentioning what it does to enzymes.
That a fever is bad is obvious from experience, so the reason never gets asked for.
Question. Why is a body temperature of 40 degrees C dangerous?
A common answer. because it feels unpleasant and makes you weak
The answer. because enzymes begin to denature, so reactions in cells slow or stop
Why. The whole point of holding 37 degrees C is that it is the temperature the body's enzymes work best at.
Every temperature answer in biology ends at enzymes. Get there.
You explain shivering as the body getting cold and shivering, with nothing in between.
The change and the response are both things you can feel, and the detecting and coordinating happen out of sight.
Question. You get cold and begin to shiver. What happened in between?
A common answer. nothing, the body just shivers when it is cold
The answer. receptors detected the drop and the brain coordinated the response
Why. Every control in the body is detect, coordinate, respond, and leaving out the middle step loses the marks.
Name all three stages every time, even when the middle one is invisible.
You write that the bladder filters the blood, or that the kidney stores urine.
Both are to do with urine and they are learned as a pair, so the two names swap easily.
Question. Which organ filters the blood?
A common answer. the bladder
The answer. the kidney
Why. The kidney filters and adjusts; the bladder only stores what the kidney has already made.
Filtering happens where the blood goes. Blood does not flow into the bladder.
WAJD spots these patterns in your child's answers and names the one behind their wrong answers, instead of just marking them wrong.