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B1 Topic 2
Jaimini Ladwa…read more

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The maintenance of a
stable internal
environment.…read more

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4 factors that need to be controlled by homeostasis:
Ion Levels: Water Levels: Temperature levels: Blood Sugar Levels:
Ions are salts Control of this is Known as Sugar is used in
(sodium) known as thermoregulation respiration
Lost through sweat osmoregulation Temperature must
Controlled by stay at 37°C to Sugar levels are high
kidneys Lost through breath, keep enzymes when food is
sweat and urine working, eaten
otherwise they
Controlled by Controlled by the
kidneys hormone insulin.…read more

Slide 4

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Negative Feedback
Negative feedback ensures that, in any
control system, changes are reversed and Receptor
returned back to the set level.
1. Stimulus:
a. The change in internal Effector
2. Receptor:
a. Detects change.
3. Effector:
a. Can be a muscle or gland.
b. Produces the response.…read more

Slide 5

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Thermoregulation…read more

Slide 6

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Structure of Skin
Erector Muscles: Control direction of
hair- raised or flat?
Sweat Glands: Produce sweat
Thermoreceptors: Nerve endings that
detect changes in (external) temperature
Sebaceous Gland: Produces a grease
called sebum
Sebum: Bacteria on the skin feed on the
sebum, rather than the skin tissue which
happens when we die as we do not
produce any more sebum, so they feed
on our skin tissues, thus, we decay.…read more

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