<span>Studies have shown that a number of psychological factors might predispose an athlete to an acute injury. Different people have different “mind-sets” for the competition and intensity of exercise or sports. If you’re overly “psyched out” by the importance you place on the number of repetitions you can do or the number of games you win, or if the environmental conditions in which you must perform aren’t ideal (“it’s too windy/cold/hot”), your psychological state could detract from your performance and put you at risk for injury. If you’re already injured and are still engaging in activity, this, too, can be a distraction that puts you at greater risk.</span>
False. this is a false statement.
When the skin is exposed to ultraviolet rays, the skin produces a molecule that is turned into Vitamin D.
Sun is the source of ultraviolet rays important for Vitamin D production. Due to this reason, in the case of Vitamin D deficiency, it is recommended by doctor's to absorb sunlight by skin. The Vitamin D production occurs specifically by UV B rays rays which lie in the range of 290-315 nanometer.
The chemical 7-dehydrocholesterol absorbs these rays and convert to previtamin D3. Further, previtamin D3 isomerizes to Vitamin D. Other than sunlight, Vitamin D can be taken through diet. The sources include seafood like fish, fish oil, dairy products, beef liver etc. Vitamin D is required for bone and teeth formation, muscle contraction, immune system etc.
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Lo siento, no hablo muy bien el español.
La anemia de células falciformes pertenece a un grupo de trastornos conocidos como enfermedad de células falciformes. La anemia de células falciformes es un trastorno hereditario de los glóbulos rojos en el que no hay suficientes glóbulos rojos sanos para transportar oxígeno por todo el cuerpo.
Normalmente, los glóbulos rojos se mueven fácilmente a través de los vasos sanguíneos. En la anemia de células falciformes, la sangre roja tiene forma de hoz o de luna creciente. Estas células pueden atascarse en pequeños vasos sanguíneos, lo que puede ralentizar o bloquear el flujo sanguíneo y el oxígeno a partes del cuerpo.
