Blood, the red fluid circulating in the body that carries oxygen and nutrients.
怪我で血が出たので消毒した。
There was blood from the wound, so I disinfected it.
献血は人の命を救う大切な行為だ。
Blood donation is an important act that saves lives.
彼の手は血で汚れていた。
His hands were stained with blood.
Refers to ancestry, lineage, or family stock (as in 'to inherit someone's blood').
彼は武士の血を引く家柄だと言われている。
He is said to come from a family that carries samurai blood.
才能は父親の血かもしれないね。
Maybe the talent comes from his father's lineage.
彼女の家系には医者の血が流れている。
There is a line of doctors in her family (she comes from a medical lineage).
A figurative use meaning feelings or passions (e.g. expressions like 'one's blood boils' or 'the blood stirs').
勝負が近づくと血が騒いでくる。
As the match approaches, my blood stirs (I get excited).
音楽を聴くと血が騒ぐような気分になる。
Listening to music makes me feel stirred emotionally.
彼は正義感が強く、血が騒ぐ人だ。
He has a strong sense of justice and is a passionate person.