lamina propria is the layer of digestive tract that contains blood vessels.
lamina propria is the layer of digestive tract that contains blood vessels.
layer of digestive tract that contains blood vessels?
lamina propria
Na
Na
the earthworm has a dual circulatory system in which both the coelomic fluid and a closed circulatory system carry the food, waste, and respiratory gases. the closed circulatory system has five main blood vessels: the dorsal (top) vessel, which runs above the digestive tract; the ventral (bottom) vessel, which runs below the digestive tract; the subneural vessel, which runs below the ventral nerve cord; and two lateroneural vessels on either side of the nerve cord. the dorsal vessel moves the blood forward, while the other four longitudinal vessels carry the blood rearward. in segments seven through eleven, a pair of aortic arches rings the coelom and acts as hearts, pumping the blood to the ventral vessel that acts as the aorta. the blood consists of ameboid cells and hemoglobin dissolved in the plasma. the second circulatory system derives from the cells of the digestive system that line the coelom. as the digestive cells become full, they release non-living cells of fat into the fluid-filled coelom, where they float freely but can pass through the walls separating each segment, moving food to other parts and assist in wound healing.
earthworm