You are planning a case-control study of lung cancer to test the hypothesis that vegetable consumption is protective against lung cancer. would you match on smoking? explain your answer.

The answer is yes.

Explanation:

Due to the fact that a very high percentage of lung cancer develops in people who had smoked, it should be necessary to include also the main cause of this cancer in the study of a factor that can prevent or avoid it. If one of the main causes is also, for example, genetics, then it should be also considered in the study.

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.

every el niño cycle is different. every year.