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6. what is a feature of low density lipoproteins
- they carry cholesterol from the liver to the cells of the body
- they carry cholesterol from the cells to the liver
- they get rid of cholesterol
7. what happens to the metabolic rate after exercise
- it increases
- it stays high for a while
- it decreases
8. what is a big problem with bacteria
- they produce toxins
- they reproduce rapidly
- they make us sick
9. what can a vaccination involve
- injecting an inactive form of the pathogen and stimulate immunity
- makes us feel sick afterwards
- makes us immune
10. what is a function of an antibody
- to lock onto antigens
- to kill an antigen
- to make us feel better
11. what do white blood cells do to combat pathogens
- they invest and destroy them
- they kill them
- they produce antibodies
12. what is a pathogen
- a desease causing microorganism
- something that makes us sick
- a microorganism that makes us better
13. what is best to have for a healthy heart
- a high proportion of hdl to ldl
- low proportion of hdl to ldl
- a high proportion of ldl to hdl