Regulation of secretory activity in the albumen gland of the pulmonate snailLymnaea stagnalis(L.)

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Abstract
The secretory activity of the albumen gland of the freshwater snail Lymnaea stagnalis was studied morphometrically (both at the light- and at the electron-microscope level) and biochemically under the following experimental conditions: (1) glandular tissue was implanted into acceptor snails and the glandular activity of the implants was compared to that of the glands of the donors and acceptors; (2) glandular activity was measured at various periods after oviposition; and (3) the activity was measured during a 24 h cycle (diurnal activity). The results indicate that cellular release of secretion material is regulated by a nervous mechanism, whereas synthetic activity is under hormonal control.

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