Most hormones are ________
A) regulated by a positive feedback mechanism
B) classified as steroids
C) released upon stimulation by other hormones
D) controlled by blood levels of ions or nutrients
E) able to diffuse through the plasma membrane of their target cells
C
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Which of the following portions of the ECG represents ventricular repolarization?
A. The P-R interval B. The QRS complex C. The P-R segment D. The T wave E. The P wave
An organ system is
A. a structure composed of several tissue types. B. the basic structural unit of all living organisms. C. a group of organs with a common set of functions. D. a group of cells with similar structure and function. E. a small structure within a cell.
An increase in body temperature causes
A. sweating. B. an increase in melanin production. C. an increase in keratinization of the skin. D. arterioles in the dermis to constrict. E. arrector pili muscles to contract.
Synovial fluid
A. is a double layer of tissue that encloses a joint. B. is a thin lubricating film covering the surface of a joint. C. provides a smooth surface where bones meet. D. is a layer of tissue that is continuous with the periosteum. E. lines the joint everywhere except over the articular cartilage.