Dalam keseharian kita, banyak kegiatan  yang kita lakukan atau terjadi di sekitar kita yang berhubungan dengan biologi khususnya transport melalui membran sel.

Perhatikan  Video berikut!

Coba sebutkan peristiwa apakah yang terjadi  dari tampilan video tersebut?

Daun salad yang mulanya layu, setelah dimasukkan dalam wadah yang berisi air dingin ternyata daun tersebut dapat segar  dan mengembang lagi daunnya.

Peristiwa mengembang dan segarnya kembali daun salad adalah salah satu fenomena yang berhubungan dengan transpor melalui membran yang disebut osmosis.

Osmosis adalah perpindahan zat pelarut melalui membran selektif permeabel dari konsentrasi pelarut tinggi menuju konsentrasi pelarut rendah.

Osmosis banyak terjadi di dalam tubuh makhluk hidup karena sel penyusun makhluk hidup memiliki membran sel yang bersifat semipermiabel. Membran semipermiabel artinya membran/selaput yang dapat dilewati oleh beberapa molekul tertentu.

Perhatikan gambar proses osmosis berikut:

Wadah di atas terdiri  atas dua larutan yaitu larutan konsentrasi tinggi (high solute/hipertonik) dan larutan konsentrasi  rendah (low solute/hipotonik).

10 thoughts on “OSMOSIS

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