• 血液けつえき — blood (as fluid)
• 出血しゅっけつ — bleeding
• 輸血ゆけつ — blood transfusion
• 熱血ねっけつ — hot-blooded / passionate
• 献血けんけつ — blood donation

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血 is a pictographic character that resembles drops of blood in a vessel. It symbolizes life force and connection to kinship or passion in metaphorical use. It’s widely used in medical and emotional contexts.

血ちが出でています。
Blood is coming out.

献血けんけつに協力きょうりょくしましょう。
Let’s cooperate in donating blood.