Is the transfer of nutrients to the cells of tissues and organs of the animal carried out by the organ system?

This is due to the circulatory system. This is a very fast way to deliver not only oxygen to certain tissues and organs, but also nutrients and various hormones. The blood completely makes a circle in our body in a little less than half a minute in a calm state. The hypothalamus is responsible for analyzing the amount of nutrients in the blood, and with a small amount of them, a feeling of hunger appears. Also, it is in the blood vessels that various medications are injected for their rapid delivery to the desired organ.