13. http://www.youtube.com/watch?v=hBTImxRZrDM&eurl=http%3A%2F%2Fvideo%2Egoogle%2Ees%2Fvideosearch%3Fq%3Dorganulos%2Bcelulares%26emb%3D0%26aq%3Df&feature=player_embedded Generalitats de la cèl·lula (5 minuts) http :// www.youtube.com / watch ?v=oXxsr6p5CEM& feature = player _ embedded Digestio celular (1 minut) http://www.youtube.com/watch?v=owEgqrq51zY&feature=player_embedded# transport de membrana en general (1 minut) http :// www.youtube.com / watch ?v=s0p1ztrbXPY& feature = player _ embedded transport passiu (1 minut) http :// www.youtube.com / watch ?v=STzOiRqzzL4& feature = player _ embedded transport actiu (1 minut) http :// www.youtube.com / watch ?v= sdiJtDRJQEc & feature = player _ embedded Osmosi (1 minut) http :// www.youtube.com / watch ?v=4gLtk8Yc1Zc& feature = player _ embedded endocitosi i exocitosi (1 minut)