Which of the following substances cause the liver to release stored sugar when the body requires extra engegy?
a. cortical steroids
b. adrenaline
c. estrogen
d. norphinephrin
Ans: a. cortical steroids
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A. releases less H+; H3PO4 B. ionizes more completely; HCl C. ionizes less completely; H2SO4 D. ionizes more completely; H2CO3
During development, some embryonic blood cells
A) differentiate into stem cells. B) move out of the peripheral tissues and into circulation. C) appear during the eighth week of development. D) enter the circulation to differentiate further. E) None of the answers are correct.
The study of cells and cellular structures is called
A) gross anatomy. B) cytology. C) histology. D) organology. E) microbiology.
The long absolute refractory period of cardiac muscle cells
A. causes the pacemaker potential. B. makes the heart prone to arrhythmias. C. prevents tetanus. D. prevents the occurrence of ectopic focuses. E. ensures a short twitch.