Quiz - 10 - Diving Knowledge Workbook - Diving Physiology

[Pedro Burrito]

From the Diving Physiology Section of the PADI Diving Knowledge Workbook Version 2.02 © PADI 2009:

2.2 Question 2

When a breath-holding diver submerges in cold water, his/her heart rate will:

a. increase.

b. decrease.

c. remain unchanged.

d. fluctuate.​

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Thank you for your patience while we try to give people something to discuss other than Covid-19 and/or Politics. I will post the answer covered by the spoiler tag later today.

 

[elmo]

Probably depends on whether the diver has seen the white shark yet

Ed: updated wildlife to be suitable for cold water

 

[Aviyes]

Well got that one wrong. Learn something new everyday.

 

[Pedro Burrito]

Spoiler: Answer

b. decrease.

The phenomenon of decreasing heart rate upon submersion is referred to as the mammalian diving reflex. Although humans have far less of a response, it is common to all diving mammals... However, in order for the phenomenon to occur, the face must be immersed, or at least moistened, in cold water.