It opens after the acetylcholine transmitter molecules reach it. This is a transmitter gated channel. It opens after the glutamate transmitter molecules reach it. This is both a transmitter and voltage gated channel. It is a glutamate activated channel, which needs not only glutamate to open, but there must appear also depolarization of the postsynaptic membrane.
Motor proteins are specialized to perform mechanical work, e.g. in a muscle.
They help to move cells around, but they are also present on the outer surface of some epithelial tissues. When not active, DNA is tightly packed like shown here. Mother cell duplicates its genetic material and some other organelles and divides into two daughter cells. The mitotic phases are interphase, prophase, metaphase, anaphase and telophase. Absorptive epithelial cell Secretory epithelial cells are specialized for synthesis and secretion of substances.