heart
The kidneys are part of the excretory system of the body. They are shaped like beans with the convex side of each organ located laterally and the concave side medial.
A concave/cavernous area of an organ is a ventricle. Like the hollow compartments in the heart.
what makes an organ system
Well actually, a cell makes up tissue. Then the tissue makes up an organ, the organ makes the organ system, then the organ system makes up an organism. But the exact amount of cells in an organism is unknown, but it is estimated to be 100 trillion.
respitory, digestive, and circulatory =
i
The pancreas is a glandular organ. It is classified as both.
Ovary
the Liver
because
There is no organ that makes sugar, necessarily. The organ that releases sugar, or helps with sugar absorption, is the pancreas. If this isn't working properly, it can result in blood sugar problems.
The male reproductive organ; the testicles.