Channel protein gates respond to all these stimuli except ________.
A. ligands
B. changes in electrical potential (voltage) across a cellular membrane
C. physical deformation of a cellular membrane
D. water in the extracellular fluid
E. chemical messengers
Answer: D
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The ________ controls movement of chyme between the last segment of the small intestine and the beginning of the large intestine.
A) pyloric sphincter B) duodenal papilla C) internal anal sphincter D) ileocecal valve E) hepatopancreatic sphincter
Which statement is correct?
a. Implantation is accomplished by enzymatic activity of the trophoblastic layer of the ovum. b. The endometrium at the site of implantation is converted into the nutrient-rich decidua. c. Implantation occurs within 24 hours after fertilization. d. Both a and b e. All of the above
During the cardiac cycle, which mechanical event immediately follows atrial repolarization?
A. Atrial systole B. Diastole of all four heart chambers C. Ventricular diastole D. Ventricular systole E. Atrial diastole
The most important factor for regulating respiratory rate is
A) bicarbonate level in the blood. B) oxygen level in the blood. C) CO2 level in the blood. D) urea concentration in the blood.