B1F REVISION NOTES

SINGLE SCIENCE, OCR BOARD - HIGHER TIER, BIOLOGY - B1F

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Keeping the balance
Homeostasis
Homeostasis maintain ( keeping ) the internal ( inside )
environment of the body
Our bodies function ( work ) most efficiently ( best ) under
optimum conditions

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Most of these conditions are monitored by the brain
The brain then adjust conditions to keep the balance
Homeostasis…read more

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Temperature
Normal body temperature is 37°C, if it gets to high or low
we could die…read more

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Danger of high and low temperature
Evie knows she must wear the correct clothing and be well
­ equipped for her expedition to help her body keep a
steady internal environment
If she gets to hot from her walk she could suffer from :
Heat stroke, when her skin becomes cold and clammy and
her pulse is rapid and weak
Dehydration because she has lost to much water
If these conditions are left untreated she could die
Evie must not get too cold on her…read more

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What your body does
Temperature too high Temperature too low
You sweat more / sweating Sweating decreases to
increases ­ evaporation loses conserve heat
heat
Bodily functions slow down Shivering converts Chemical
Kinetic Heat energy
Vasodilatation ­ When the Vasoconstriction ­ When the
body body is to
gets to hot cold
Blood capillaries in the skin Blood capillaries in the skin
dilate and so the blood flow constrict and so less blood
increases, bring more blood to flows through them, reducing
the surface where it…read more

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Temperature regulation
Carbon dioxide
This is kept at a constant level by increasing / decreasing
heart and breathing rate…read more

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Water
Water in the blood is regulated by the kidneys ; they can
absorb more or less and reabsorb the water…read more

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Blood sugar / Glucose
This is regulated by the pancreas…read more

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Diabetics do not produce enough insulin so most have to
inject themselves with insulin
The dose is dependent on diet and exercise
Food increases blood sugar
Exercise decreases blood sugar
Hormones
The endocrine system in the body containing glands which
realises hormones directly into the blood stream
Endocrine gland Hormone What hormone does
made by
gland
Pituitary ­ also Growth Controls growth
called the master hormone
gland because it
makes many
hormones which
control other
glands in the body
+ ASD
( Kidney ) +…read more

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Pancreas Insulin Controls the amount if
sugar ( glucose ) on the
blood
Ovaries ( only in Female sex Controls the female
females ) hormone characteristics e.g.
breasts
Testes ( only in Male sex Controls the male
males ) hormone characteristics e.g.…read more

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