When light is absorbed by a rod photoreceptor it causes the cell to
A. close ion channels and release more neurotransmitter.
B. open ion channels and release more neurotransmitter.
C. close ion channels and stop releasing neurotransmitter.
D. open ion channels and stop releasing neurotransmitter.
Answer: C
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Organic acids, or metabolic acids, are generated during the normal process of
A) metabolism. B) metabolic generation of water. C) exhalation. D) reabsorption. E) active secretion.
In the resting state of the membrane, which of the following situations exists for voltage-gated sodium ion channels?
A) The activation and inactivation gates alternate between being closed and open. B) The inactivation gate is open and the activation gate is closed C) The activation and inactivation gates are both closed. D) The activation gate is open and the inactivation gate is closed.
Which occurs during the secretion of hydrochloric acid by gastric epithelial cells?
A. Bicarbonate ions are secreted into the hepatic portal circulation. B. There is a decrease in the pH of blood in the hepatic portal circulation. C. Both H+ and K+ are actively pumped from the epithelial cell cytosol into the lumen of the stomach. D. Chloride ions are pumped from the cytosol of the gastric epithelial cells into the hepatic portal circulation blood. E. Vesicles containing H+/K+ -ATP-ase proteins are endocytosed into vesicles within the gastric epithelial cells.
In chewing a bite of apple, what actions are are you performing with your mandible?
A. Adduction and abduction B. Lateral and medial excursion C. Protraction and retraction D. Eversion and inversion E. Depression and elevation