When a human's blood pressure increases,
signals are sent from
the blood vessels to
the brain. Then, the
brain sends a message
to the heart, telling
the heart rate to slow
down.

Is this an example of
positive or negative
feedback? How do you
know? Explain how the
situation could be the
opposite (for instance,
if you said that the
example above is
positive feedback, then
explain a scenario
where it could be
negative feedback).