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Major New Function Discovered For the Spleen
circletimessquare writes "The spleen doesn't get much respect — as one researcher put it, 'the spleen lacks the gravitas of neighboring organs.' Those undergoing a splenectomy seem to be able to carry on without any consequences. However, some studies have suggested an enhanced risk of early death for those who have undergone splenectomies. Now researchers have discovered why: the spleen apparently serves as a vast reservoir for monocytes, the largest of the white blood cells, the wrecking crew of the immune system. After major trauma, such as a heart attack, the monocytes are disgorged into the blood stream and immediately get to work repairing the damage. '"The parallel in military terms is a standing army," said Matthias Nahrendorf, an author of the report. "You don't want to have to recruit an entire fighting force from the ground up every time you need it."'"
Somehow, I always find it amazing the things we don't know about. We know the makeup of the universe down to a couple of percentage points. We know what subatomic particles do what, and have theories to predict other ones that have virtually no effect on our universe. We know when the sun is going to run out of fuel and have pretty accurate theories about what will happen to the solar system when that happens.
Yet, somehow, we don't know the basic workings of our own bodies.
Both are the sorts of organs we needed a long time ago, when infections and food poisoning would have been everyday occurrences, but not so much anymore. So it's no surprise that their functions aren't that obvious.
what idiot modded this insightful? it's a joke!
But this doesn't explain why the spleen was so difficult: what would I see if I looked at a slide of spleen under the microscope (or if more advanced equipment than my eye and a microscope did the same thing)? If not a noticeably larger proportion of white blood cells than elsewhere, why not (e.g., did preparation destroy them, are the hidden or stored elsewhere, etc.)?
Clearly, something must have been going on for us not to have realized this sooner. (Or, perhaps, we've discovered only part of the story--it's happened a lot over history and still happens today, as much as we like to pride ourselves with our knowledge and technology.)
R.Mo
The obsession, is relatively reasonable. What isn't reasonable is the tendency to relegate still useful things into that category.
The ability to wiggle ones ears is a pretty good example, unless you can do it, you'd never appreciate the help that is in figuring out where sounds are coming from. Sure it's not as useful as it was. Well, scratch that, with all the randomly beeping things we have in the modern era it helps one figure out where they are hiding.
As the owner of a vintage splenectomy (circa 1955) I can assure you that anyone missing a functioning spleen is at a great disadvantage combatting the normal toxins and viruses prevalent in modern life.
In my particular example, the spleen was removed because it was enlarged, although, as it turned out later, not diseased. The loss of this organ did nothing to aid in my recovery, but rather considerably retarded it. My liver was also slightly abnormal, but luckily for me, no one considered that it was advisable to remove that organ.
In the discussion of how undiscovered functions for minor organs are overlooked by hospitals and surgeons, one should not also overlook the profit motive.
Why not...
Two hearts? difficult to coordinate two hearts. Also, chances are that if damage is extreme enough to destroy the heart, chances are that a backup heart wouldn't significantly boost the chance of reproductive success after that point. (Heart disease is irrelevant as it occurs after reproductive age.)
Two brains? first of all, it'd be impossible to coordinate the actions of two brains. Second, the brain already has quite a bit of internal redundancy. Sufficiently young children with entire hemispheres removed can grow up normally. People who suffer multiple concussions can still switch in spare circuitry and return to normal capacity (at least until later in life.)
Two mouths? Where would you put the second one, and what structure would you develop into it? Evolution doesn't allow an organism to develop a structure wherever it would be convenient, but only to modify existing ones to suit a new purpose.
The kidney is a simple organ prone to infection and mounted in a vulnerable position in the body. I can definitely see how having a spare would increase the odds of reproductive success at minimum cost.