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Célula: La célula
es un sistema muy complejo que es el centro de intercambios intensos
en energía y que presenta áreas extensas de la interfase.
Como todos seres vivos, la célula se nutre, crece, se multiplica
y muere. Cromatina : Parte visible al microscópico del núcleo
de una célula, que constituye una condensación densa y
forma el núcleo. Núcleo: Parte central de una célula que contiene
los cromosomas. Mitocondria : Organó del citoplasma de las células
que se ocupa de la oxidación y el almacenamiento de la energia. Nucléolo : Particule nuclear que juega un rol en la fisiológica
de una célula. Membrana nuclear : Tejido organico muy delgado que envuelve el
nucleo de la célula. Proteina: Conjunto que contiene aminoacidos, de masa molecular
importante. Grano de melanina : Pigmento de coloracion cutanea. Membrana plasmatica : Membrana muy delgada que recubre la
célula. Ribosoma : Organito citoplasmico de la célula, se ocupa
un rol importante por la sintesis de las proteinas. Glucogeno: Sustancia que forma glucosa del organismo humano. Citoplasma: Parte que contiene la célula. Retículo endoplásmico : Conjunto de fibras de la
parte central del citoplasma. Aparato de Golgi: Sistema de granulacion del citoplasma. Centriolos: Estructuras cilindricas del centrosoma. Lisosoma: Organito intracelular que puede absorber las particulas
solidas del medio ambiente.
Foto :
EN : Goat
FR : Chèvre
ES : Cabra
Domestic goats are one of the oldest domesticated
species. For thousands of years, goats have been used for their milk,
meat, hair, and skins all over the world. Most goats naturally have
two horns, of various shapes and sizes depending on the breed. While
horns are a predominantly male feature, some breeds of goats have horned
females. Polled (hornless goats) are not uncommon and there have been
incidents of polycerate goats (having as many as eight horns), although
this is a genetic rarity thought to be inherited. Their horns are made
of living bone surrounded by keratin and other proteins and are used
for defense, dominance, and territoriality.
Goats are ruminants. They have a four-chambered
stomach consisting of the rumen, the reticulum, the omasum, and the
abomasum. Goats have horizontal slit-shaped pupils, an adaptation which
increases peripheral depth perception. Because goats' irises are usually
pale, the pupils are much more visible than in animals with horizontal
pupils but very dark irises, such as sheep, cattle
and most horses.
Both male and female goats have beards,
and many types of goats may have wattles, one dangling from each side
of the neck. Some breeds of sheep and goats appear superficially similar,
but goat tails are short and point up, whereas sheep tails hang down
and are usually longer, though some are short, and some long ones are
docked.
Animation : Célula
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Objet virtuel : Célula
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