TeamBernard Cardiovascular System What is the dive reflex Data for the dive reflex Draw a reflex arc for this response What is the mechanism causing this response Why would humans who are typically not diving animals retain this reflex ID: 592857
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Slide1
April, Bill, Grace, Tommy
#TeamBernard
Cardiovascular
SystemSlide2
What is the dive reflex?
Data for the dive reflex.
Draw a reflex arc for this response.
What is the mechanism causing this response?
Why would humans, who are typically not diving animals, retain this reflex?
Questions:Slide3
What is a dive reflex?
aka diving response
set of reflexes activated under several conditions
enables body to manage and tolerate lower levels of oxygenSlide4
breath-hold over water
60 sec recovery from submerging
Dive Reflex DataSlide5
The Dive Reflex ArcSlide6
Dive Reflex ArcSlide7
Dive Reflex ArcSlide8
Dive Reflex ArcSlide9
Dive Reflex ArcSlide10
Dive Reflex ArcSlide11
Dive Reflex ArcSlide12
Dive Reflex ArcSlide13
Dive Reflex ArcSlide14
Dive Reflex ArcSlide15
Trigeminal skin receptors on the nose sense cold water, the signal is sent to medulla.
In medulla, the cardiovascular control system coordinates the dive response by:
Increasing
the parasympathetic stimulus to the cardiac pacemaker in order to decrease heart rate.
Increasing
the sympathetic stimulus to arterioles in extremities stopping circulation in those areas
What is the mechanism causing this response?Slide16
Why would humans, who are typically not diving animals, retain this reflex?
Diving reflex is a shared trait among all mammals
Some mammals use the reflex to dive for extended periods of time (seals, dolphins, etc)
Humans, however, retained the reflex in order to survive drowning in extreme circumstances
We can assume that drowning was a common enough cause of death in human evolution as to affect reproductive successSlide17
Have a safe Halloween! (: