Download Reading Worksheet KEY 6.4, pg 250 6.4_rw_key

Biology RW 6.4
Avoiding Disruptions: The Immune System page 250
NAME___KEY__________
1. What is the body’s largest organ?
The skin
2. Define pathogen:
any disease causing micro organisms
3. Name 5 “natural doors” into the body.
Mouth, nose, ears, eyes, genitals
4. What is the first line of defense in the immune system?
Saliva, tears, sweat, mucus
5. What does a plant do to protect itself from infected fungus?
Sacrifices infected part by producing chemicals that kill the area
6. What is a macrophage?
Nonspecific scavenger cell that helps protect the body against pathogens
7. Name 3 functions of the macrophage in the immune system defense.
Activates helper T cells
Acts as a general in the immunity army
Activates Killer T cells and b cells
Engulfs pathogens
Processes antigens
8. Name 2 differences and 2 similarities between cell-mediated response and antibodymediated response?
Similar: Both defend the body
difference: One kills toxins
Work with the immune system
One kills viruses
Respond to body pain
9. Define antibodies:
Protein molecules that recognize the pathogens
10. What are 3 examples of the immune system working against the host?
Bee sting reaction
venom
Hay fever
pollen
Asthma
animal dander
11. With so many defenses, how does the body get sick? (give at least 3 examples)
The system has limits
AIDS
Infection becomes too wide spread
Escapes detection
Self and Nonself page 254
12. How is self identified on red blood cells?
On the surface of the RBC there are molecules that signal for the specific blood type
13. What happens if a person with blood type B receives blood from a person with a
blood type A?
Blood type B attacks the other and the person can become ill and die
14. Define and give an example of autoimmune diseases:
Causes the body to damage itself
Arthritis, Multiple sclerosis
Immune System Memory page 255
15. What is memory of infection?
The ability of certain immune cells to remember an infection or disease
16. Where do the immune cells store the memory?
Molecular structure
17. Name 3 pathogens that once you have been exposed you are usually immune.
Measles, mumps, chicken pox
18. What have doctors used to exploit our bodies ability to remember?
Vaccines
19. Can you get sick from a vaccine?
May cause a minor immunity response but you don’t get the disease
20. Why are there still many diseases without a working vaccine?
Dozen of varieties of similar viruses can cause the same symptoms