B cells are involved in the specific immune response that exhibits specificity, memory and self-non-self distinction. This immune response is also called as adaptive immunity. B cells are produced in the bone marrow. An encounter of B cells with antigen activates them for multiplication.
The activated B cells produce plasma cells which in turn produce specific antibodies that bind to the specific antigens and start the adaptive immune response.
Siphons in Mollusca are tube-like structures in which water (or, more rarely, air) flows. The water flow is used for one or more purposes such as locomotion, feeding, respiration, and reproduction.
The siphon propels the squid through the water in the opposite direction to which the siphon is pointing, much like jet propulsion. To use this jet propulsion, the squid takes in water through the large opening and then closes off the opening.
