Let me accord you a little aback story. As abounding of you know, I’m new to scienceblogs, and one of the aboriginal things we get to do is accompany a bulletin lath abounding of all the bloggers (sciblings) here. Well, acknowledgment it to say, a advancing altercation took abode amid me and addition scibling, which resulted in my actuality alleged a absolute n00b in advanced of the absolute world.
So, what bigger way to accomplish accord than by accepting me — an astrophysicist — acknowledgment a catechism about physiology?! Let’s booty a attending at what I’ve got, aback I’m a common adviser of questions:
Why is my pee chicken in the morning, but bright in the evening?
The animal anatomy is a admired affair of mine, and has been anytime aback I answered the catechism of whether a animal has added beef or a galaxy has added stars? Well, let’s booty a attending at what’s in your pee:
Sure, a accomplished lot of ions and chemicals, salts, proteins, enzymes, hormones, and added metaites are begin in urine. But what makes it yellow? The characteristic chicken blush comes from urobilin, which is a actinic formed, eventually, from the breakdown of hemoglobin. You can akin (kind of) see how it happens; alpha with a heme group:
and again breach it bottomward and aish the iron! Booty a attending at how akin these molecules are:
So aback your urine contains a lot of urobilins, it’s absolutely yellow, and aback it’s low on urobilins, it’s afterpiece to clear. So that’s the accessible answer, but we can dig a little deeper. Aboriginal off, what are we accomplishing antibacterial all of this hemoglobin? Don’t you charge it to live?
Of advance you do, but your circulatory arrangement is consistently acclimation backup parts. Your anatomy is consistently authoritative new red claret cells, replacing the old ones every 4 months or so.
But there are about 30 abundance red claret beef in the animal body, acceptation you are both antibacterial (and making) new red claret beef at a bulk of about 2.7 actor beef per second. What’s more, is that every red claret corpuscle has about 270 actor claret molecules in it, with anniversary one able of accustomed four oxygen molecules (and accepting four heme groups).
All told, d you beddy-bye for 8 hours at night, your anatomy has destroyed 78 billion red claret cells, now has to get rid of 8.4 x 10^19 heme molecules, and has ingested no baptize over that time. Now, best of these molecules wind up in your stool instead of your urine, but they’ve been able to actuate that archetypal animal urine contains about 8 mg of urobilin, which equates to about 10% of the aged heme molecules ambagious up in there.
But over the day, you’re bubbler water, and so you’re diluting the bulk of urobilin in your urine by a cogent amount, acceptance you to pee bright by the afternoon beneath accustomed circumstances. Someone like me — who drinks about 4 liters of baptize a day — gets their black urine bottomward to about one-sixth of the urobilin body begin in their morning pee. Put simply, the free agency for advantageous bodies is hydration.
And so my friendly, horizon-expanding claiming aback to you, bearding scibling, is for you to accost and acknowledgment a concrete science catechism of your choosing! If you’d like a little help, I can point you to the best contempo Carnival of Space (#97) for inspiration!
You’ve got a accomplished Universe out there to accept from…
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