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Mammalian Diving Reflex

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Haley Wall

on 19 January 2012

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Transcript of Mammalian Diving Reflex

Mammalian Diving Reflex Allows us to stay under water for a longer period of time
Cold water contacting the face initiates the diving reflex
Submersion of other body parts does NOT trigger the reaction Diving Reflex in Mammals 2. Apnea 3. Peripheral Vasoconstriction Facial submersion's
3 main responses 1. Bradycardia Deep diving exposes us to high pressure,
during which our capillaries in our extremities
close off, no longer allowing blood circulation. Sea anemone During very deep dives, a blood shift occurs organs and circulatory walls let
plasma and/or water pass through thoracic cavity. blood shift occurs to ensure that the pressure remains constant, preventing organs from being crushed So...
The alveoli fill up with blood plasma until the animal leaves its pressurized surroundings. then the blood plasma is reabsorbed. Cranial Nerves Receptors on face respond to the cold water
and inhibit these sensory nerves Trigeminal nerve Vestibulocochlear nerve located in the medulla oblongata (lowermost portion of brainstem)
controls the rate and depth of respiratory movements of the diaphragm and other respiratory muscles RC stimulates respiratory muscles
respiration muscles stop moving
volume of lungs remain unchanged (Stops entry of water) Chemoreceptors
Arteries Cardiovascular Center

Nervous System Parasympathetic Sympathetic
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