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Biology B1 Topic 2




B1 Topic 1
Homeostasis
Biology Topic 2 Plant Hormones
Nervous system
Topic 3
B2
Science B3



Chemistry
Physics




Homeostasis - the body's ability to maintain a stable internal environment

Thermoregulation - control of body temperature

Osmoregulation - control of water

Blood Glucose regulation - control of…

Page 2

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Biology B1 Topic 2


Homeostasis

Homeostasis is the maintainance of a constant
internal environment in response to a changing
external environment.

Hormones have an important role in this system
they are released by glands, in to the blood
stream, where they reach target cells. A specific
hormone will fit a…

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Biology B1 Topic 2




Homeostasis is.....

It is important because....



enzymes




Endocrine System

Draw a table showing
the gland, hormones
produced and the
function for each




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Page 4

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Biology B1 Topic 2


Negative Feedback

Negative feedback is the mechanism by which the body
maintains conditions within particular limits. The body
will do this by opposing a change that deviates from the
normal.




Thermoregulation
Human life is only compatible with a narrow range of
temperatures. Core temperature changes within…

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Biology B1 Topic 2


Thermoregulation
Temperature in mammals is detected by
thermoreceptors in the skin and hypothalymus which
is in the brain.

Changes in temperature bring about nerve impulses
from the brain to the muscles and glands which will
bring about changes depending on whether it is hot or
cold.…

Page 6

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Biology B1 Topic 2


Complete the diagrams to explain the responses to
change in temperature




Why is thermoregulation so important?




Surface Area to Volume Ratio




Small objects have a
much larger sa:vol
ratio and therefore
loose heat much
faster than larger
objects
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Page 7

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Biology B1 Topic 2


Hyperthermia--Overheating of the body caused only by an
external factor, as for example a hot environment, or a hot
bath.

Hypothermia--A low body temperature, as caused by
exposure to cold weather or a state of low temperature of
the body induced by decreased metabolism.


Thermoregulation Worksheet…

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Biology B1 Topic 2


Osmoregulation




Complete the table showing the steps for osmoregulation




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Biology B1 Topic 2


Blood Glucose Control

Certain tissues like the brain and retina are very sensitive to
changes in glucose levels. An excess or deficit of blood glucose
for more than a few hours can result in the loss of consciousness
and brain damage.

The level of glucose in…

Page 10

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Biology B1 Topic 2


Blood Glucose levels change
throughout the day

Plot this data in a graph

Explain the pattern it shows using
information about the blood
glucose control mechanism
include negative feedback loops




Test the urine samples using clinistix
What do you notice?
Can you explain the results?

negative…

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