Ch#13 | Gaseous Exchange | Lec #18 | Diving Reflex (Mechanism of Diving Reflex) (FSc Biology part 1)

DIVING REFLEX:
Aquatic mammals especially cetaceans e.g.
whales can stay in the depth of the ocean for about two hours without coming up for air.
Diving mammals have almost twice the volume of blood in relation to their body weight as compared to non divers.
Most of the diving mammals have high concentration of myoglobin in their muscles. binds extra oxygen.
Mechanism of Diving Reflex:
When a mammal dives the diving reflex is activated and breathing stops, the rate of heart beat slows down to one tenth of the normal rate.
The consumption of oxygen and energy is reduced.
The blood is redistributed but most of the blood goes to the brain and heart, which can least with stand anoxia.
Skin, muscles and digestive organs and other internal organs receive very little blood while an animal is submerged because these areas can survive with less oxygen.
Muscles shift from aerobic to anaerobic respiration.
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