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As with most animals, the function of the integumentary system is to serve as a protection barrier. It also produces necessary vitamin D and produces pigment to protect from the sun's harmful rays.
It is bypassed because there is no need for the blood to go to the lungs and get "pick up" if the pig is dead.
I realize that this was meant to be a question, and one, if I may add, that is remarkable similar to one I recently answered, in which case I will paste my answer from the last one. The thoracic cavity contains the heart and lungs, both of which are constantly expanding and contracting. The ribs in the thoracic cavity serve both as protection and support, allowing the lungs to expand and contract without running the risk of putting itself into a dangerous situation, including even external threats (or more likely itself). The abdominal contents, opposingly, are more muscular and less prone to damage, and do not need such excessive protection. Moreover, other areas such as the brain are encased in a cranial cavity of bone, and like the thoracic cavity, the organs enclosed are quite fragile. The abdominal cavity, also, contains the stomach, which may expand, which is impossible when a layer of bone is surrounding it, as is expelling it's wastes into the pelvic cavity.
A secondary adaptation is a trait that originated as a by-product (i.e., served no function of it's own, but accompanied an adaptation), but was shaped over time by natural selection to serve it's own unique function.
The seminal vesicles of earthworm's serve a primary role in reproduction. They are the location of production, storage, and release of sperm in males.
The epithelium and blood vessels in the nasal cavity serve to warm and moisturize the air as a person breathes it in. This is to prevent the delicate membranes of the alveoli from being damaged by cold dry air.
Does the ductus ateriosus serve as a shunt in a fetal pig?
Pitocin is used in childbirth to induce labor. There are several risks associated with the use of pitocin including fetal distress, painful contractions, and increased likelihood of requesting an epidural.
To serve a ritual function.
A cavity that both digestive and circulatory serve are called cylindrical. This is the purpose of cnidarians.
How does cholesterol function
By the Function they serve
Egagt
The function of seeds are for the plant to reproduce.
they serve as controllers
the head
By the Function they serve