In Order to Understand the Way the Brain and Nervous

question 101

Multiple Choice

 In order to understand the way the brain and nervous system function, it is important to remember that

• A) the nervous system communicates primarily via electrical messages.
• B) the nervous system communicates primarily via chemical messages.
• C) communication in the nervous system depends on how large the action potentials are.
• D) communication in the nervous system is dependent on both electrical and chemical messages.

---

Definitions:

LC50

The lethal concentration of a substance that causes death in 50% of a population of test organisms within a specified period, a common measure in toxicity tests.

Teratogens

Agents or factors that can cause the development of physical defects in an embryo or fetus during pregnancy.

Birth Defects

Birth defects are physical or biochemical abnormalities present at birth that can result in physical, mental, or emotional disability or dysfunction.

Mutations

Changes in the DNA sequence of a cell's genome, which can lead to variations in the traits of an organism, and are a primary source of genetic diversity.