Blood vessels are the most abundant structures
The most important cations in the human body are sodium, potassium, magnesium, and calcium ions
The most abundant element in any organic structure, including the human is hydrogen.
The most abundant chemical substance in the human body is water. There are a lot of H2O molecules throughout the human body.
collagen (:
The second most abundant substance in the human body is proteins. Proteins are essential for various functions in the body, including building and repairing tissues, supporting the immune system, and serving as enzymes and hormones.
Proteins are the second most abundant substance in the human body and are essential for the structure, function, and regulation of all cells. They play a critical role in various biological processes such as growth, repair, and immunity.
Magnesium
magnesium
calcium
ejaculation
Oxygen
The most genetically complex structure in the human body is the brain.