Largest muscle
Who
gluteus maximus
What
40 percentage
Where
When
Muscles normally account for 40% of human bodyweight in men and 35% in women. The bulkiest of the 639 named muscles in the human body is usually the gluteus maximus or buttock muscle, which extends the thigh. However, in pregnancy the uterus or womb can increase from about 30 g (1 oz) to over 1 kg (2.2 lb) in weight.