Imperfect evolution (Introduction)

by Balance_Maintained , U.S.A., Tuesday, January 20, 2015, 08:25 (3595 days ago) @ David Turell

Wouldn't this kind of be expected, though? 
> 
>David: No, they are talking about arrhythmias, in cardiologic parlance 'abnormal rhythm' What they were seeing was abnormally slow rhythms and abnormally fast ones, not fitting the activity. We humans have a dive reflex which slows your heart as you hit the water. In rare circumstances it has killed.-Yeah, um, of course their heart rate is abnormal then. I hate to sound like this is a DUH moment, but it kind of is. Ok, put your blindfold on and forget the article. As a cardiologist, tell me what YOU would expect in this scenario:-You hold your breath for 10 minutes. When you start the ten minutes, you are submerged in water that is about 62°. Assume minimal physical exertion, hold on to a brick and sink down 300m (deep dolphin dives). What's happening? The water temperature drops ten to twenty degrees to between 40-50°F, the pressure increases more than 30 atmospheres, and your blood is slowly deoxygenating while nitrogen bubbles form in your body. To compensate, your heart rate slows like a yogi, taking you down to a minimalist state. Now that you are under the water, you can float with minimal effort, so the slow heart rate doesn't hamper you too much. 
At this point, you have a challenge. Catch something before you drowned while fighting localized currents that buffet you with forces in excess of 4 tons per square meter, and make it back to the surface without getting the bends. What do you, as a cardiologist, predict would happen under these circumstances? Do you think "normal" even applies under these conditions? -
> > 
> > Tony: It reminds me of an electric hydraulic motor, or the motor for a pressure washer or generator. They don't run hard all the time. They cycle depending on load.
> 
> David: Here you are describing normal cardiac activity related to exercise. There is a direct correlation between calorie work load and pulse rate different for each individual based on their state of fitness, with a maximal rate limited by advancing age.-Yes, but doesn't that also depend on other conditions, temperature, oxygen in the blood vs. muscular demand, etc?

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What is the purpose of living? How about, 'to reduce needless suffering. It seems to me to be a worthy purpose.