Porocytes are tubular cells which make up the pores of a sponge known as ostia.
Covering the sponge is a layer of cells known as the pinacoderm, which is composed of pinacocytes. In a sponge, pinacocytes are a thin, elastic layer which keeps water out. Between the pinacocytes, there are the porocytes that allow water into the sponge. Myocytes are small muscular cells that open and close the porocytes. Once through the pores, water travels down canals. The opening to a porocyte is a pore known as an ostium.
Oh holy night, the stars are brightly shining
It is the night of the dear Saviour's birth
Long lay the world in sin and error pining
'Til He appeared and the soul felt it's worth
A thrill of hope, the weary world rejoices
For yonder breaks a new and glorious morn
Fall on your knees, oh hear the angel voices
Oh night divine, oh night when Christ was born
Oh night divine, oh night, oh night divine
Led by the light of faith serenely beaming
With glowing hearts by His cradle we stand
So led by light a star is sweetly gleaming
Here came the wise men from out of Orient land
The King of kings lay thus in lowly manger
In all our trials born to be our friends
He knows our need, He guardeth us from danger
Behold your King, before Him lowly bend
Behold your King, before Him lowly bend
Fall on your knees, oh hear the angel voices
Oh night divine, oh night when Christ was born