Some interesting evidence of evolution!

Did you know that humans evolved from creatures that lived in the water once? But what is the evidence?
I won’t go into boring details of how that happened but I will give very interesting evidence from your body! Ready? Let’s start
I want you to try to put your fingers in your neck as in the following image
Do you feel the pulsation? Hopefully yes. This is your carotid artery. It is one of the arteries that supply the head and neck with oxygen, and here how it looks in real.
Now let’s go back and see how this system in the picture above looked like when you were a fetus inside your mother! This system, during embryological life, is called the aortic arch.
(THIS PHOTO ILLUSTRATES THE AORTIC ARCH SYSTEM FOR A FETUS)
The aortic arches numbered from 1 to 6 (photos on the left) most of them disappear as you see and only a few of them stay to give rise to the carotid artery and other arteries in the neck (the photo on the right). So, we don’t need to have all of these aortic arches from 1 to 6 as in pictures, we need a few of them. This is why most of them disappear.
Since we don’t need arches from 1 to 6 as they mostly disappear, why they appeared in the first place? Why does an embryo have all of these arches since we need only a few of them?
The answer here is that fish and other water creatures that we evolved from have these aortic arches and they persist because they need them since the gills are supplied by this system! Humans don’t have gills, hence the system mostly disappeared leaving only some remnants that we need.
A) Primitive fishes, represented by sharks, have six paired gill arches. (B) In teleosts, the gill arch arteries are reduced to form four pairs in the caudal branchial arches.
Look the transformation (evolution) from A to E
(E) In mammals, the fourth aortic arch arteries become bilaterally asymmetrical and the outflow tract separates into two distinct outflow vessels.
In tetrapods, they are modified and reduced in number as seen below.
Understanding the embryological structures is interesting! Isn’t it?

Comments

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