A marker on the surface of a foreign substance that identifies it to immune cells as foreign to the body is called a(n) ________.
Fill in the blank(s) with the appropriate word(s).
antigen
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After a child's birth, the decrease in right atrial and left atrial pressure produces closure of the _____ ovale
Fill in the blank with the right word.
Which of the following is involved in successful behavior change?
A. choosing goals and designing specific strategies to meet them B. having willpower and support of friends and family C. having an ultimatum set by an authority figure such as a doctor D. writing out a list of reasons to change E. having a burning desire to change
Upper respiratory infections are caused by which type of virus?
a. togavirus b. rhinovirus c. retrovirus d. hepadnavirus
Which symptom of a heart attack is more likely in men than in women?
A) Pain in the center of the chest B) Shortness of breath C) Pain between the shoulder blades D) Fatigue