Destruction of antigens or cell lysis can be caused by all of the following except
A) helper T cells.
B) cytotoxic T cells.
C) antibody actions.
D) macrophages.
E) complement system.
Answer: A
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The process of producing the formed elements of blood is called
A. leukopenia. B. hemopoiesis. C. leukocytosis. D. erythroblastosis. E. agglutination.
Which of the following is not a substance found in saliva?
A. Hydrochloric acid B. Mucin C. Bicarbonate ion D. Amylase E. Lysozymes
Which development occurs in the eighth and ninth months of fetal development?
A) Eyebrows and eyelashes appear over partially open eyelids. B) Eyelids partially open and the lungs begin to produce surfactant. C) Neuron networks form, lanugo is shed, and blood cells form in the bone marrow. D) Fat is deposited in subcutaneous tissues, and the eyelids can completely open.
Mammography and bone densitometry are good examples of which of the following types of medical imaging?
a) computed tomography b) magnetic resonance imaging c) ultrasound scanning d) radionuclide scanning e) low-dose radiography