Human beings can synthesize all twenty amino acids the body must have
Indicate whether the statement is true or false.
FALSE
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Which of the following are nerves of the posterior division of the brachial plexus?
A) axillary nerve B) radial nerve C) musculocutaneous nerve D) ulnar nerve E) both radial and axillary nerves
The regulation of smooth muscle contraction is mediated by the phosphorylation of ____ in response to calcium binding to ____
a. myosin; calmodulin b. actin; calmodulin c. troponin; calmodulin d. myosin; troponin e. actin; troponin
Which type of epithelium lines the nasal cavity, the trachea, bronchi, and parts of the male reproductive tract?
A) pseudostratified ciliated columnar epithelium B) transitional epithelium C) stratified squamous epithelium D) stratified cuboidal epithelium
An excess of hormones in the blood may cause target organs to decrease the number of receptors for that hormone in a process called
A. negative feedback B. receptor inhibition C. down-regulation D. positive feedback