1 00:00:00,333 --> 00:00:06,221 In the last video we saw how blood sugar concentration, or, 2 00:00:06,221 --> 00:00:14,608 glucose concentration in your blood of 80mg/dL 3 00:00:14,608 --> 00:00:18,280 was kind of a normal fasting blood glucose, if you hadn't eaten for eight hours -- 4 00:00:18,280 --> 00:00:23,715 or "before a meal," and the fancy word we learned in the last video was 'preprendial.' 5 00:00:23,715 --> 00:00:25,957 What I want to do in this video 6 00:00:25,957 --> 00:00:30,646 --because 80mg/dL really does not make a lot of tangible sense to me, 7 00:00:30,646 --> 00:00:33,232 I do not know exactly how much sugar that is-- 8 00:00:33,232 --> 00:00:35,370 what I want to do is try to put this into different units 9 00:00:35,370 --> 00:00:40,057 so that we can better conceptualize how much sugar that might be in our bodies. 10 00:00:40,057 --> 00:00:43,168 So let us just do a little bit of unit analysis over here. 11 00:00:43,168 --> 00:00:49,306 So if we have 80mg/dL-- 12 00:00:49,306 --> 00:00:54,126 --that's what we're talking about; that's a normal, fasting blood glucose level-- 13 00:00:54,126 --> 00:00:55,601 now let us think about how much that is per liter. 14 00:00:55,601 --> 00:00:58,374 A deciliter is a tenth of a liter. 15 00:00:58,374 --> 00:01:03,135 So if we want to cancel out the units, we want dL in the numerator 16 00:01:03,135 --> 00:01:09,934 so we want to know dL per L, so that "that" and "that" will cancel out. 17 00:01:09,934 --> 00:01:14,380 There are 10 dL's per L. 18 00:01:14,380 --> 00:01:22,547 And so that gives us 80*10 is 800mg per-- 19 00:01:22,547 --> 00:01:24,345 --dL's cancel out-- 20 00:01:24,345 --> 00:01:30,058 800mg per L. Now if we want that in terms of grams, 21 00:01:30,058 --> 00:01:34,532 we can just multiple to get rid of that 'mg,' so we put in the denominator, 22 00:01:34,532 --> 00:01:41,541 and put 'g' in the numerator. 1g is 1000mg. 23 00:01:41,541 --> 00:01:46,928 So, once again, milligrams cancel out, and you have 800/1000. 24 00:01:46,928 --> 00:01:52,547 So, 800/1000 is 0.8g/L. 25 00:01:52,547 --> 00:02:04,343 And then to make sense to normal human bodies--I looked this up on the internet-- 26 00:02:04,343 --> 00:02:11,727 the average human body, I'm assuming--I'm like, 5'9", 150lbs, so I think I'm pretty close to average-- 27 00:02:11,727 --> 00:02:16,928 but they said that the average human body has about 5L of blood. 28 00:02:16,928 --> 00:02:23,940 So let us multiple this...0.8g/L * 5L/average human 29 00:02:23,940 --> 00:02:28,724 Obviously a smaller human will have less, and a larger human will have more blood flowing through them... 30 00:02:28,724 --> 00:02:33,554 But this is an average person right over here, so the Liters cancel out, 31 00:02:33,554 --> 00:02:50,736 and so we get 0.8 * 5 = 4, and then we have grams per average human. 32 00:02:50,736 --> 00:02:52,362 4g/human. 33 00:02:52,362 --> 00:02:55,938 And just to get an idea of what 4g are: 34 00:02:55,938 --> 00:03:04,761 1 teaspoon is equal to 4.2g. So 4g is almost a teaspoon. 35 00:03:04,761 --> 00:03:13,724 So, 4g is approximately 1 teaspoon of glucose per human being. 36 00:03:13,724 --> 00:03:19,947 So in your entire bloodstream you have about a teaspoon of sugar that your cells can do whatever your 37 00:03:19,947 --> 99:59:59,999 cells need to do.