muscular system
nervous system
cardiovascular system
respiratory system
Heart, Lungs, Brain, and your Skin. Yes Skin is an organ.
== ==
heart
4-5 ltrs in human body.
There are more than 4 types of cells in the human body. There are about 200 different types of cells. Each cell has a different function.
Protein provides 4 calories of energy per gram in the human body.
3 to 4 grams
About 2 to 4 grams
4 line of symmetry
4 organs
The average protein digestion time in the human body is around 4-6 hours.
About 4 vans and 3 minivans About 4 vans and 3 minivans About 4 vans and 3 minivans About 4 vans and 3 minivans