The structure of the mesoderm that induces formation of the neural tube is the
A. head mesenchyme.
B. paraxial mesoderm.
C. amnion.
D. notochord.
Answer: D
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Which of the following statements regarding hormonal regulation of gastrointestinal function is TRUE?
A. The presence of fatty acids in the small intestine stimulates the secretion of the hormone secretin, which causes contraction of the gallbladder. B. The presence of fatty acids in the stomach stimulates secretion of CCK, which in turn stimulates enzyme secretion by cells in the antrum of the stomach. C. The presence of amino acids in the small intestine stimulates secretion of gastrin, which in turn stimulates HCl secretion by parietal cells. D. The hormone somatostatin stimulates the secretion of H+ into the lumen of the stomach. E. An increase of H+ in the small intestine stimulates secretion of the hormone secretin, which in turn stimulates HCO3- secretion by the pancreas.
The enzyme that breaks down table sugar is
a. maltase b. lactase c. sucrase d. enterokinase e. peptidase
How are the forearm muscles grouped?
What will be an ideal response?
The very brief moment following stimulation when a muscle remains unresponsive to additional stimulation is called the
A. relaxation B. contraction C. refractory period D. latent period