What is the function of histamine?
A. It is a vasodilator that speeds blood flow to injured tissues.
B. It is a chemical that kills bacteria.
C. It is a clotting factor.
D. It is a signal to B cells to produce antibodies.
E. It is an anticoagulant that inhibits blood clotting.
Answer: A
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All of the following are characteristics of adaptive defenses except
A) versatility. B) tolerance. C) memory. D) specificity. E) present at birth.
Each terminal bronchiole supplies air directly to
A) a single pulmonary lobule. B) over 150 million alveoli. C) a single alveolar duct. D) several alveolar sacs. E) about 6500 bronchioles.
Which of the following is not under dual control of the ANS?
A. Gastrointestinal motility B. Salivary gland activity C. Adrenal medulla activity D. Pupil diameter E. Heart rate
Red bone marrow contains a high amount of ________
A) stem cells that produce blood cells B) fat C) elastic tissue D) cartilage