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animals obtain their nutrients by the consumption of other organisms(Fowler et al., 2013) this allows us to take that energy and go far and wide whether technological or innovative all our energy comes from outside sources stored for later use

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Upon taking a breath if you hold it for too long youll either pass out for feel kight headed this is due to the circulatory and respiratory system, whose function is to obtain oxygen and discharge carbon dioxide (Fowler et al., 2013)

If we didnt have a fully functional set of kungs we wouldnt be able to release the posionous gas after turning oxygen into carbon dioxide it excapes or would kill us.

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Blood circulates inside blood vessels and circulates unidirectionally from the heart around one of two circulatory routes(Fowler et al., 2013)

While in mammals this is the case in invertebrate the blood is free flowing and circulating throught the body while still being pumped by the heart it surrounds its organs rather than be restricted to blood vessels and arteries as it is in our body.

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The endocrine glands secrete hormones into the surrounding interstitial fluid(Fowler et al., 2013) this is the fluid that is seperated by blood vessels the main purpose of endocrine js its homormonal effects on the body there are a few different types of these glands in the body Pituitary,Thyroid,Parathyroid,Adrenal,Pancreas with pituitary and andrenal have to seperate ones each releases a horomone that directly correspond to growth or other essential bodily functions

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The human body has 206 bones(Fowler et al., 2013) while an infant would have more the skeleton is an important function of the body without it you would be a bag of flesh or an invertebrate you also need muscles and tendons to manipulate the body hence Musculoskeletal

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The central nervous system (CNS) is made up of the brain and spinal cord and is covered with three layers of protective coverings called meninges(Fowler et al., 2013)

This is quite essential the second most part of the structures that run thw human body without it no pain regulation, no back ground work, no movement. The nervous system keeps the body moving so you can focus on other things.

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A functioning immune system is essential for survival, but even the sophisticated cellular and molecular defenses of the mammalian immune response can be defeated by pathogens at virtually every step(Fowler et al., 2013) while it is the bodys first line of defense it also falls very easily especially if one is already infected with a disease that specifically targets the immune system

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They involve specialized and different anatomies in the two sexes, a hormone regulation system, and specialized behaviors regulated by the brain and endocrine system.(Fowler et al., 2013) frankly without this system we would no longer exist it stands as the only meams we have of natural birth

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All images and citation

https://openstax.org/books/concepts-biology/pages/18-3-human-reproduction?query=Reproductive%20organs&target=%7B%22index%22%3A0%2C%22type%22%3A%22search%22%7D#fs-idm21069760