1. 59. What is homeostasis?
Maintaining constant and stable internal conditions despite changes in the outside environment.
Works like a thermostat controlling room temperature

2. 60. How does a nerve impulse travel through the nervous system (describe an electrochemical impulse)
Part electrical and part chemical transmission of signal.

3. 61. What is a synapse and how does the impulse travel across the synapse?
Synapse- gap between two neurons. Signal is carried by chemicals (neurotransmitters) across the gap

4. 62. What is a reflex arc?
Reflex arc- when nerve impulse does not travel all the way to the brain first to respond to stimuli. Can react faster

5. 63. When you experience the “fight or flight” response, your adrenal glands secrete the hormone adrenaline. What is the result of this?
You can react faster. Increased heart and breathing rate. Heightened senses

6. 64. What is a hormone?
A chemical signal that is produced by endocrine glands. Include testosterone, adrenaline, growth hormone, etc.

7. 66. How does the HIV virus reduce you ability to fight off infections?
The HIV virus attacks your body’s immune system. You are not able to fight off pathogens

8. HIV targets the immune system
HIV- Human Immunodeficiency Virus
Retrovirus (contains RNA) that attacks and weakens the immune system

9. Leads to “opportunistic” infections
HIV is transmitted by exchange of blood or other body fluids

10. HIV reproduces in T-cells (cells that trigger immune responses)
HIV leads to AIDS (Acquired Immune Deficiency Syndrome)