Small areas of the myocardium contracting chaotically is called
A. bradycardia.
B. tachycardia.
C. flutter.
D. fibrillation.
Answer: D
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All of the following contain blood vessels except the
A) epidermis. B) papillary layer. C) reticular layer. D) subcutaneous layer. E) hypodermis.
Groups of cells that are similar in structure and perform a common or related function form a(n) ________
A) tissue B) organism C) organ D) organ system
Which of the following statements about the Na+/K+ pump is FALSE?
A) Its activity requires the expenditure of metabolic (cellular) energy. B) It transports Na+ and K+ in a 1:1 ratio. C) It is present in neurons. D) It transports Na+ out of the cell and K+ into the cell.
Before B cells secrete antibodies, they differentiate into ________.
A. stem cells B. macrophages C. plasma cells D. antigen-presenting cells E. T cells