The average life of a mature red blood cell
120 minutes
120 hours
120 days
120 years or a lifetime
120 days
120 days
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Which is most likely a result of hypersecretion of growth hormone?
A. Dwarfism B. Increased secretion of growth hormone-releasing hormone (GHRH) C. Decreased plasma concentration of IGF-I D. Decreased secretion of somatostatin E. Acromegaly
The extracellular matrix of connective tissue consists of
a) enzymes and membranous organelles. b) plasma membranes and ground substance. c) keratinized cells and protein fibers. d) calcified crystals of minerals and enzymes. e) protein fibers and ground substance.
What enzyme is needed to start the cross bridging process?
A. Kinase B. Cereatine phosphatase C. Ca2+ATPase D. Myosin ATPase
What is the function of antidiuretic hormone (ADH)?
A. Causes large urine volume B. Stimulates loss of water by the kidneys C. Stimulates retention of water by the kidneys D. Causes a darkening of the skin