________ are stationed throughout the body, always in connective tissue, and operate both in the allergy response and to expel foreign invaders.
A. Antigens
B. Antibodies
C. Mast cells
D. Natural killer cells
Answer: C
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The muscle tendons that merge to form the Achilles tendon are the gastrocnemius and plantaris.
Answer the following statement true (T) or false (F)
What is the function of the foramen ovale during fetal life?
a) Allowing blood to flow directly from the right atrium into the left atrium. b) Allowing blood to flow directly from the right ventricle into the left ventricle. c) Serves as a valve in the vena cava to regulate venous blood flow. d) Prevents back flow of blood from aorta into the left ventricle. e) Prevents back flow of blood from pulmonary trunk into the right ventricle.
Which of the following statements is NOT accurate with respect to erythrocytes?
A) They migrate into infected regions of tissue. B) They transport oxygen and carbon dioxide. C) They lack mitochondria. D) They lack nuclei. E) They contain large amounts of hemoglobin.
All EXCEPT which of the following structures belong to the conducting zone of the respiratory tract?
A. epiglottis B. larynx C. glottis D. alveoli