Summary CIE A-level Biology: Hormones and Homeostasis (A* achieved)
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Module
CIE A2 Biology
Institution
CIE A2 Biology
Book
Cambridge International AS & A Level Complete Biology
Hi everyone:)) Here are my CIE A2 level Biology topic notes for the syllabus. These notes are tailored to the A level syllabus as well as the mark scheme as if you do enough past paper questions you will see a recurring pattern with the types of questions asked about each topic. My notes include s...
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HOMEOSTATIC CONTROL MECHANISMS
3 input: Control
Output:
center
Information information sent
sent along along efferent
pathway to
pathway to
Effector
Receptor (sensor)
2 Change
detected
by receptor
5 Response of
effector feeds
back to influence
Too much.
Stimulus: magnitude of
Imbalance
Produces stimulus and
change returns
in variable variable
homeostasis
Variable (In homeostasis)
Imbalance Too little.
Regulation Through Negative Feedback
corrective action
deviation return toward
from set pol set point
set point
(optimal conditions)
stress
corrective action
Stress or disturbance changes the internal environment.
Change is detected by receptors.
Corrective measures are activated.
Corrective measures counteract the change back toward set point.
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