Males tend to be bigger than females, and have have a larger proportion of muscle mass. As a consequence, males need bigger hearts to supply the bigger amount of muscle.
An adult is larger so the heart is larger. A human is smaller than an elephant and the elephant has a larger heart.
Because it grows!
The human stomach is bigger than the fetal pig's. This of course is if the human is an adult human.
four
The ossa coxae (containing the ililum, ishium, and pubic bones) are not fused in a fetal skeleton like in an adult human.
The fetal pig has a four-chambered heart and not three-chambered. The chambers are divided between the upper and the lower chambers.
The first is the fetal skull, which is much more malleable than an adult human skull, secondly it is much, much smaller than an adults'.
A fetal chick grows into a chicken, whereas a fetal human grows into a human.
The size of your palm
In an adult heart there should not be any direct connections between the two sides of the heart.
it is the size of your palm or wrist
For an average adult human, 5 percent of the blood supply enters or leaves the heart with each heartbeat.
A frog's heart has only three chambers, and a human's heart has four chambers.
Believe it or not, it's an adult human heart