Our body is made up of trillions of cells, each with their own unique purposes and needs. All cells must create energy, make proteins, get rid of waste, and other functions. To accomplish feeding so many cells and removing their waste, our circulatory system (blood, veins, arteries) runs by most cells in the body. Nutrients are carried to (and waste from) all our cells constantly.
As for what cells need nutrients in our body, a good way to be able to tell is if blood runs to the site. This includes almost every part of your body and every single cell except for your outermost layer of skin (epidermis), your fingernails and toenails, and your hair. None of these things bleed when scratched or cut (not including underlying tissue) so we know no nutrients are being fed to those cells by blood. Every other part of the body however does require nutrients in order to survive and carry out daily functions. I hope that answers your question!
No comments:
Post a Comment