Which of these best describes most African cultures until the 1800s?

The science of the Mayas led to the development of:

How many people died as a result of World War 1? 

What components contribute to the blood brain barrier?

Looks at the histology of the spinal cord in the picture. What section of the spinal cord is this image from?

Judd was in an accident and suffered brain damage resulting in a coma.  Which part of the damaged brain is keeping him in the coma?

The patellar reflex is a polysnaptic reflex which includes a sensory neuron, interneuron, and motor neuron that sends signals to the brain to process.

The blood brain barrier consists of blood vessels and astrocytes in the gyri of the brain and functions to selectively prevent some molecules from entering the brain, like immune cells.

Ventral horns receive sensory information and process that to send to the brain.

REM sleep occurs at several times in the night during sleeping and is when dreams occur.