Which of the following substances undergo tubular secretion:
What will be an ideal response?
hydrogen ions
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The heel of the foot is formed by the ________.
A. calcaneus B. patella C. talus D. navicular bone E. cuboid bone
A membrane permeable only to Na+ separates two compartments containing Na2SO4 as shown below
Electrodes are placed in both compartments and a voltage applied (compartment A is held at 0 mV). What voltage applied to compartment B would result in NO net movement of Na+ across the membrane separating the compartments? A. –60 mV B. –30 mV C. 0 mV D. +30 mV E. +60 mV
How could a diet deficient in vitamin A affect vision?
A) Deficiency in vitamin A reduces the amount of aqueous humor available to circulate to the tissues of the anterior chamber. B) Deficiency in vitamin A reduces the amount of retinal that the body could produce, thereby interfering with night vision. C) Deficiency in vitamin A reduces the amount of opsin that can be produced, reducing the wavelengths of light that can be absorbed. D) Deficiency in vitamin A reduces the amount of red cones, causing red-green color blindness. E) Deficiency in vitamin A blocks the production of all cone pigments, causing total color blindness.
Which of the following events occurs last?
A. release of renin by the kidney B. release of aldosterone by the adrenal cortex C. sodium reabsorption by the kidney tubules D. angiotensinogen ? angiotensin I E. angiotensin I ? angiotensin II