आदित्सोरन्नपानानाम् आसन्कुक्ष्यन्त्रनाडयः ।
नद्यः समुद्राश्च तयोस् तुष्टिः पुष्टिस्तदाश्रये ॥ २९ ॥
aditsoh-desiring to have; anna-pananam-of food and drink; asan-there became; kuksi-abdomen; antra-intestines; nadayah-and the artery; nadyah-the rivers; samudrah-seas; ca-also; tayoh-of them; tustih-sustenance; pustih-metabolism; tat-of them; asraye-the source.
When there was desire to have food and drink, the abdomen and the intestines and also the arteries became manifested. The rivers and the seas are the source of their sustenance and metabolism.
The controlling deities of the intestines are rivers, and those of the arteries, the seas. Fulfillment of the belly with food and drink is the cause of sustenance, and the metabolism of the food and drink replaces the waste of the bodily energies. Therefore, the body's health is dependent on healthy actions of the intestines and the arteries. The rivers and the seas, being the controlling deities of the two, keep the intestines and the arteries in healthy order.