While the human brain makes up only _____ of the bodys weight, it requires about _____ of the bodys resources when at rest.
a. .75; 8
b. 2; 15
c. 4; 25
d. 7; 30
Question 2
Why is it thought that advances such as agriculture, literacy, and urbanization have not been accompanied by additional increases in brain size?
a. The earliest Homo sapiens were as intelligent as contemporary humans.
b. Although brain size has remained constant, brain density has increased.
c. The physiological cost of a bigger brain exceeds its benefit.
d. More efficient neuronal connections account for modern human advancements.
(A) The levels of the spinal cord and spinal nerves. (B) Photograph of the spinal cord as it descend
Fetal development of human
Structure of the globular domain of human PrP in monomeric
brain
Brain Hemisphere Activity
The photo is a cross-section of thickened human skin