Monday, November 12, 2012

Transpor aktif primer dan Transpor sekunder

Transpor aktif primer membutuhkan energi dalam bentuk ATP, sedangkan transpor aktif sekunder memerlukan transpor yang tergantung pada potensial membran. Kedua jenis transpor tersebut saling berhubungan erat karena transpor aktif primer akan menciptakan potensial membran dan ini memungkinkan terjadinya transpor aktif sekunder.

Transpor aktif primer dicontohkan pada keberadaan ion K+ dan Na+ dalam membran. Kebanyakan sel memelihara konsentrasi K+ lebih tinggi di dalam sel daripada di luar sel. Sementara konsentrasi Na+ di dalam sel lebih kecil daripada di luar sel.

Transpor aktif sekunder dicontohkan pada asam amino dan glukosa dengan molekul pengangkutannya berupa protein transpor khusus. Pengangkutan tersebut bersama dengan pengangkutan Na+ untuk berdifusi
ke dalam sel. Pengangkutan Na+ adalah transpor aktif primer yang memungkinkan terjadinya pontensial membran, sehingga asam amino dan glukosa dapat masuk ke dalam sel.


Gambar (a) Proses transpor aktif. (b) Fagositosis, (c) Pinositosis, (d) Endositosis.

                          Gambar (a) Proses transpor aktif. (b) Fagositosis, (c) Pinositosis, (d) Endositosis.

Penjelasan Materi Lainnya



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