The answer is body's line of defense. The first line of defense which includes physical as well as chemical barriers would defend the body from infection. It would include the tears, cilia, stomach acid,urine, white blood cells,mucus and the skin. The skin is the largest organ and would act as a barrier from pathogens. If first line of defense won't work the second line will then be activated.
<span>Your body meets the challenge of its stressors by:
- reacting with heightened levels of awareness, focus and physical reactivity. </span>
Answer: Medical oncologist: A doctor who specializes in diagnosing and treating cancer with chemotherapy and other drugs. A medical oncologist is different from a surgical oncologist, who mostly treats cancer with surgery.
Explanation:
The AV valves close first, then the semilunars open and close, then the AV valves open
