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small air-filled sac-like structures from which the lungs are made
liquid which fills the spaces around the cells. It is derived from blood plasma but lacks the...
an allergic reaction that triggers the immune system causing constriction and inflammation of...
the nerve cells that transmit nerve impulses towards the central nervous system from the...
a non-membrane bound structure made of proteins and nucleic acids that occurs within the nucleus...
reproductive or sex cells that contain the haploid set of chromosomes. The male gametes are...