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0:00
Hello, I'm Dr.
Angelina Fong from
the Department of
Anatomy and Physiology
from the University of
Melbourne in Australia.
In this recording, we are
going to explore how we sense
the world around us
as well as how we
sense what's going
on inside our body.
This is really key and
important in how we
maintain normal
physiological function.
0:27
You may recall earlier in
this series we discussed
the concept of homeostasis.
The idea about
homeostasis is that we
maintain a relatively constant
internal environment.
We say relatively
constant because
it is not a steady state where
nothing changes but things are
kept within a comfortable range.
Our body is constantly responding
to changes around us in
the environment as
well as changes
within our internal
organs and systems.
But we need to be able to
detect these changes in
order to respond to
maintain homeostasis.
1:08
There are constantly changes
from the external environment.
If you imagine these might
be temperature changes,
you might detect movement
of air around you,
you might detect the sight,
and right now you're
hearing my voice.
These are all external inputs.
We have to somehow sense these
and determine whether we
need to respond to it and
how do we respond to it.
There are also
internal factors that
change such as
movement of our limbs,
our muscles, as well as
changes in our blood pressure.
How our body is responding to
this it's all part of the
homeostatic response.
We'll explore how these changes
occur a little bit
later in the series.
But right now in this
particular recording,
we're going to look
at the ways or
mechanisms that the body
detects these changes.
