Identify at least one function of the 12 organ systems related to nutrition

"Human systems 

Humans have a variety of systems due to the complexity of the species' organism. These specific systems are widely studied in Human anatomy. "Human" systems are also present in many animals. 

* Circulatory system: pumping and channeling blood to and from the body and lungs with heart, blood and blood vessels. 
* Digestive system: digestion and processing food with salivary glands, esophagus, stomach, liver, gallbladder, pancreas, intestines, rectum and anus. 
* Endocrine system: communication within the body using hormones made by endocrine glands such as the hypothalamus, pituitary or pituitary gland, pineal body or pineal gland, thyroid, parathyroids and adrenals, i.e., adrenal glands.;) 
* Integumentary system: skin, hair and nails. 
* Lymphatic system: structures involved in the transfer of lymph between tissues and the blood stream, the lymph and the nodes and vessels that transport it including the Immune system: defending against disease-causing agents with leukocytes, tonsils, adenoids, thymus and spleen. 
* Muscular system: movement with muscles. 
* Nervous system: collecting, transferring and processing information with brain, spinal cord, peripheral nerves and nerves. 
* Reproductive system: the sex organs, such as ovaries, fallopian tubes, uterus, vagina, mammary glands, testes, vas deferens, seminal vesicles, prostate and penis. 
* Respiratory system: the organs used for breathing, the pharynx, larynx, trachea, bronchi, lungs and diaphragm. 
* Skeletal system: structural support and protection with bones, cartilage, ligaments and tendons. 
* Urinary system: kidneys, ureters, bladder and urethra involved in fluid balance, electrolyte balance and excretion of urine." 

I’d say a : water molecules

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