00:01
So other influences that
can affect respiration rate
include influences from
our higher brain centers.
00:09
So we have the hypothalamus,
which has which is going to act
through the limbic system
in order to modify the rate
and depth of respiration.
00:19
Examples are,
when you hold your breath
because you're angry
or when you gasp
and response to pain
all of these are going to be
controlled by the hypothalamus.
00:31
Also a change in
your body temperature
leads to a change in
your respiration rate.
00:38
So there's a direct
correlation between the two
as your body temperature rises.
00:45
So does your rate
of respiration.
00:47
So for example,
when you go for a run,
yes, your body is
starting to heat up
because you're going through all
these different
metabolic processes.
00:55
But if you notice you
also start to breathe
a little faster as well.
01:01
We also can control
our breathing
by way of the cerebral cortex.
01:06
These cortical controls
direct signals from the
cerebral motor cortex
and bypassed the
medullary controls.
01:16
An example of this,
is voluntarily
holding your breath.
01:21
We are able to do this by
way of the cerebral cortex.
01:25
However,
if we hold our breath too long,
we are medullary centers will
take over and
reinstate breathing
so that our blood CO2
levels don't drop too low.
01:41
So another influence are going
to be pulmonary irritants.
01:45
So receptors and are bronchioles
are able to respond to irritants
like dust or accumulated mucus
or noxious fumes.
01:55
These receptors are
going to communicate
with the respiratory centers
via the vagal nerve afferents.
02:01
So vagal nerves going
up toward the brain.
02:05
This is going to
promote reflexive
constriction of
our air passages.
02:11
And this is what
leads to us coughing.