El aparato de Golgi es un complejo de vesículas planas, cada una de ellas rodeada por una membrana, y apiladas las unas sobre las otras.
- Origen y función del aparato de Golgi
El aparato de Golgi debe su nombre al médico italiano Camillo Golgi, que lo describió por primera vez a finales del siglo XIX. Es aquí donde son elaborados los productos sintetizados por el retículo endoplasmático, y almacenados en pequeñas vesículas excretoras, que son transportadas a su vez a la superficie interna de la membrana citoplasmática.
Cuando estas pequeñas vesículas entran en contacto con la membrana citoplasmática se funden con ella, descargando su contenido fuera de la célula: este proceso de denomina exocitosis y es el mecanismo a través del cual las células liberan las sustancias que producen.
<span>In the gametes (e.g. sperm or egg)</span>
Explanation: The shape of a river's stream bed affects the speed and eroding power of a river by influencing the amount of friction between the water flowing through the river and the stream bed below. Friction is the force that opposes the motion of one surface as it moves across another surface. In a river, there is friction between the flowing water and the stream bed beneath it. Where a river is deep, less water comes into contact with the stream bed, so there is less friction. The reduced friction means there is less opposition to the water's motion, so the river flows at a greater speed and has more kinetic energy for erosion. On the other hand, where a river is shallow, more water comes into contact with the stream bed, so there is more friction. The increased friction means there is more opposition to the water's motion, so the river flows at a lesser speed and has less kinetic energy for erosion. Also, the roughness of a stream bed covered with boulders and other obstacles causes the water to flow through the river in a turbulent fashion. This could cause the river to move slower in some cases or erode more in other cases.
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