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.
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
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