血细胞

血 = 丶 + 皿 : Mnemonic symbol: blood transfusion.

Xu Xian hurt himself and needs to get a blood transfusion in the elevator's bathroom. He found a petal leaf as donor, which is bleeding droplets into a bowl; Xu Xian gets the blood from the bowl as infusion using some tubes.

细 = 田 + 纟 : Marie Curie inspects her farm in the space station's bathroom. She set up a field where innocent silk worms have to die only for the production of fine and slender silk threads.

胞 = 包 + 月 : The moon (月) got a child in front of the aorta (ao1). Beelzebub (b) finds that the placenta (胞) is a small moon cake, which he places in his colorful handbag (包) for later.