blood
血 centers on blood as the vital fluid of life, covering its literal sense and its symbolic use for lineage or deep connection.
血 is a pictograph of a ritual vessel with a drop of blood inside, representing blood as a sacred substance. The modern form retains the vessel 皿 and a small top stroke suggesting the blood drop.
The bottom 皿 is a dish, and the small stroke on top is a drop of blood. Imagine a dish collecting a single drop of blood, making the meaning clear.
For ケツ, picture a medical test where you get your blood checked: the nurse says 'Kets' as a short, sharp sound when drawing blood, like 'kets' -> ケツ.
blood
blood
bleeding; haemorrhage; hemorrhage
blood vessel; vein
vampire; bloodsucker
blood pressure
blood sugar
nosebleed
anemia; anaemia
leukemia; leukaemia
bloodshed
blood donation
blood relationship; consanguinity
blood transfusion
mixed race; mixed parentage
white blood cell; leukocyte; leucocyte
high blood pressure; hypertension
bloodstain
cerebral hemorrhage; cerebral haemorrhage
hemophilia; haemophilia
internal bleeding; internal haemorrhage; internal hemorrhage
blood type; blood group
blood test; hemanalysis