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Revision as of 23:26, 15 February 2021
Sangre y defensas del cuerpo | ||
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Asociación General
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Destreza: 2 Año de introducción: 2000 |
Requisitos
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Para consejos e instrucciones, véase Vida microscópica.
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Human blood consists of about 45% blood cells, and 55% plasma.
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Red blood cells transport oxygen to the rest of the body and carry the carbon dioxide away. Blood carrying oxygen appears bright red. When you cut yourself, your blood is exposed to oxygen in the air, and this is sufficient to cause it to turn color. When little oxygen is present is the blood, it is still red, but it is much darker, tending more towards black. Blood is neither blue nor green inside your veins, but it looks this way sometimes because the veins themselves and pigment in your skin impart a bluish tint.
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Blood clotting occurs in two stages called primary hemostasis and secondary hemostasis. Primary hemostasis begins immediately after the wall of a blood vessel is broken. Platelets in the blood bind to a protein called collagen which is found in the vessel wall. Normally the collagen is hidden from the platelets, but when the blood vessel is broken, it becomes exposed. When the platelets bind with the collagen, it forms a plug which slows the flow of blood through the break in the blood vessel.
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Encourage your Pathfinders to ask their parents about their immunization records. These days pediatricians usually send immunization records home with the parents, so they should have them somewhere at home.
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An infectious disease is any sickness caused by a biological agent (such as a virus, bacteria, or parasite) as opposed to being caused by a physical agent (such as a burn or a cut).
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AIDS is an acronym for acquired immunodeficiency syndrome or acquired immune deficiency syndrome and is defined as a collection of symptoms and infections resulting from the specific damage to the immune system caused by infection with the human immunodeficiency virus, commonly called HIV. Although treatments for both AIDS and HIV exist to slow the virus' progression in a human patient, there is no known cure.
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Referencias
- Categoría: Tiene imagen de insignia
- Categoría:Libro de Respuestas de Especialidades JA/Especialidades
- Categoría:Libro de Respuestas de Especialidades JA
- Categoría:Libro de Respuestas de Especialidades JA/Nivel de Destreza 2
- Categoría: Libro de respuestas de especialidades JA/Especialidades introducidas en 2000
- Categoría:Libro de Respuestas de Especialidades JA/Asociación General
- Adventist Youth Honors Answer Book/Unknown/es
- Adventist Youth Honors Answer Book/Unknown/Primary/es
- Categoría:Libro de Respuestas de Especialidades JA/Etapa 0
- AY Honors/Prerequisite/Microscopic Life/es
- AY Honors/See Also/Microscopic Life/es