1. Frog’s Heart
heart,

2. organ that serves as a pump to circulate the blood. It may be a straight
tube, as in spiders and annelid worms, or a somewhat more elaborate
structure with one or more receiving chambers (atria) and a main pumping
chamber (ventricle), as in mollusks. In fishes the heart is a folded tube, with
three or four enlarged areas that correspond to the chambers in the
mammalian heart. In animals with lungs—amphibians, reptiles, birds, and
mammals—the heart shows various stages of evolution from a single to a
double pump that circulates blood (1) to the lungs and (2) to the body ... (100
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human’s heart

3. bird’s heart
crocodile
frog

4. fish
Frogs have three-chambered hearts and fish have two-chambered
hearts. Therefore, the heart of frogs (or amphibians) are more
efficient and there is less mixing of oxygenated blood and
deoxygenated blood.
frog is an amphibian; fish is a water organism.both are from two
habitats, they have two different types of modifications, in fish, it is
called branchial heart as it pumps only to gills and a venous heart
as only de-oxygenated blood flows through it
An amphibian heart only has three chambers, true, but this does
not necessarily mean it is less efficient. amphibians also utilize
cutaneous respiration, so they are oxygenating blood through their
skin as well as their lungs. Essentially, they have oxygenated blood
and deoxygenated blood mixing at the base (the connection point)
of their left and right atria, which then empty into the ventricle, and
is pumped throughout the body. They don't need the four-
chambered heart to keep O2 and de-O2 blood separate (the so-
called more efficient heart) because they have a more surface area
by which to absorb oxygen.
How Do The Aorta Of A Frog
And Human Differ?
By: Tina Twito
Break Studios Contributing Writer
Have you ever thought to yourself, "How do the aorta of a frog and

5. human differ?" To best understand the difference between the
aorta of a frog and that of a human you first need to look at basic
differences in their hearts.
The most obvious difference between anuran (the group that
includes frogs and toads) and human hearts is the number of
chambers. A frog's heart has three chambers while humans' have
four. While both types of hearts have two atriums for blood
collection, the three-chambered heart has only one ventricle to
send it back out into the body. So, in a three-chambered heart,
oxygenated blood and deoxygenated blood enter the same
ventricle. To keep them from mixing too much, frog hearts have
specialized ridges to help sort the blood out and direct it to the
right place: the lungs or the body. There is some mixing though, so
it's not as efficient as the four-chambered model (with two
ventricles) that keeps the blood from mixing in the first place.
So where does the aorta come into all this? And how is the aorta of
a frog different from that of a human? All aorta serve the same
purpose: to take oxygen rich blood to all parts of the body. The
aorta of humans is a singular body with five segments, including a
u-shaped arch towards the top .
In fish there are two aorta: the ventral aorta that carries blood to
the gills, and a separate dorsal aorta that carries the blood to the
body. This works well with a fish's two chambered heart. While
amphibians, including frogs, have a more complicated heart
structure, they retain a connecting vessel so that the aorta has two
parallel arches. (It forms a "heart" around their heart.) In the end,
that second arch is the main difference between the aorta of a frog
and a human. The second major difference would be the quality of
oxygenated blood that is being carried in the aorta. As mentioned
before, the blood on the human aorta will be richer.
Even earthworms, which don't have hearts, have aortic arches. It's
really fascinating to note that as we move to "higher" species we
lose more of the aortic arches we share in the embryological
stage. It's easy to see why the study of the aorta of different
animals is so important to scientists as they study the patterns that
connect us all.
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