Skin cancer is most likely to develop from
A. pigmented epithelial cells.
B. nonpigmented epithelial cells.
C. pigmented melanocytes.
D. nonpigmented melanocytes.
Answer: B
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Answer the following statements true (T) or false (F)
1. Artificial passive immunity can be effective even after a person has been exposed to the infectious organism. 2. The surface protein on a cancer cell or a microorganism can be an antigen. 3. An antibody and an antigen fit together like a key in a lock. 4. Antigens have the ability to neutralize specific toxins in the body. 5. When an antigen and an antibody unite, macrophages can destroy the antigen more efficiently.
The nervous system and certain chemicals can cause the constriction of a blood vessel. This is known as
A. platelet adhesion. B. vascular spasm. C. hemostasis. D. coagulation.
An enlarged R wave on an ECG would indicate
a. a myocardial infarction. b. an enlarged ventricle. c. cardiac ischemia. d. repolarization abnormalities.
Which of the following is not a feature of skeletal muscle?
A. Extensibility B. Contractility C. Excitability D. Autorhythmicity E. Conductivity