Respuesta :
In a closed circulatory system, gaseous exchange through thin walls of capillary beds.
The circulatory system is essentially a network of cylindrical vessels: the arteries, veins, and capillaries that radiate from the heart, which acts as a pump. This is a closed-loop system in which the blood is not free in a cavity in all vertebrate creatures and certain invertebrates.
Blood is confined inside blood vessels in a closed circulatory system and flows unidirectionally from the heart around the systemic circulatory route before returning to the heart.
Larger, more complicated crustaceans, such as lobsters, have arterial-like arteries to drive blood through their bodies, whereas the most active mollusks, such as squids, have evolved a closed circulatory system and can move quickly to acquire prey.
Closed circulatory systems are a feature of vertebrates; nonetheless, there are major changes in the structure of the heart and blood circulation amongst vertebrate species due to adaptation during evolution and accompanying anatomical differences.
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