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Amino Acids are absorbed into circulation after the complete digestion of proteins.
digestion absorption circulation diffusion synthesis
systemic circulation - BETWEEN the heart and lungs
digestion, absorption, circulation,diffusion, synthesis
All of them actually, especially if we're talking about a complex organism such as an animal or advanced plant. Tissues (specialized cells organized in a group) perform specific functions for the benefit of the entire organism, so you need tissues for every metabolic funtion to sustain life and assure reproduction. This means digestion, respiration, circulation, endocrine, reproduction, integumentary systems, skeletal (in advanced animals) and anything else I may have forgotten!
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digestion
Digestion turns ingested food into usable nutrients. Circulation carries these nutrients to all body cells.
digestion->absorption->circulation->diffusion->synthesis
Amino Acids are absorbed into circulation after the complete digestion of proteins.
Respiration Digestion Circulation
If you mean "absorption" when you say "circulation", digestion is necessary because the body cannot absorb the nutrients directly from food. The nutrients are "locked" inside. Digestion breaks food apart so that nutrients can be more easily accessed and absorbed.
free amino acids only
portal
Digestion, excretion, respiration, ingestion, and circulation.
Other than blood circulation, you mean? No, I wouldn't think so. As far as I know there are no direct interactions between hearth and uterus.
Larynx