Anatomy 101: Human Body Quiz

Those 2.6 million sweat glands are distributed all over the body, excepting the lips, nipples and genitals.

The hand sports 27 bones, barely edging out the foot's 26 bones.

Michael Jackson sang about smooth criminals, but blood vessels, bladders and airways are smooth muscles.

No blood gets into the heart without passing through the superior vena cava and the inferior vena cava first.

The shoulder is an appendicular bone, which means it was made to move. Those bones are connected to axial bones like the cranium, spine and ribs, which form the axis of the body and protect delicate organs.

Thirty feet. The intestines count for most of it.

Adult humans have little to no brown fat, the presence of which helps keep babies warm.

Human brain growth is attributed to a larger cerebral cortex, which is charged with tasks including memory, thought processes and motor functions.

The brain consists of more than 100 billion nerve cells called neurons, each of which comes equipped with a cell body, axon and dendrite.

More than a third of the U.S. population has type O+ blood.

We start off life with 350 bones. However, bones fuse together as we grow, leaving an adult with only 206 bones.

In a lifetime, the average person produces enough saliva to fill a couple of swimming pools -- 25,000 quarts!

There are typically four types of stem cells: embryonic, fetal, umbilical and adult stem cells.

Get your tissues! Your nose begins to run because tear ducts drain into the back of the nose.

The lighter the hair, the more hair follicles are present on the human head. However, on average, the human head has about 100,000 hair follicles.

Your eyeballs are controlled by six muscles. This enables you to look up, down, left and right.

The Adam’s apple is cartilage found on the larynx. This protruding cartilage is often more noticeable in men. Researchers say that the larger the Adam’s apple, the deeper the voice.

Blood has a long road to travel! There are about 60,000 miles (96,561 kilometers) of blood vessels in the human body.

Although we often hold the left side of our chest when saluting the flag, our heart is actually slightly to the left in the middle of the chest.

The human skin’s thickness averages just 2 millimeters. Your skin gets an eighth of all your blood supply.