What is tubular secretion?
a) the movement of water and solutes from the tubular fluid into the blood
b) the movement of water and solutes from the glomerular capillaries into the glomerular capsule
c) the movement of water and solutes from the blood into the tubular fluid
c) the movement of water and solutes from the blood into the tubular fluid
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Which of these processes occurs during a cell's first gap (G1 ) phase?
A) The nuclear envelope breaks down. B) The cell synthesizes the enzymes that control mitosis. C) The chromatin condenses into visible chromosomes. D) The cell synthesizes proteins and grows. E) DNA is semiconservatively replicated.
Which blood vessels of the renal medulla run alongside the nephron loops?
A. Efferent arterioles B. Vasa recta C. Arcuate arteries D. Henle's vessels E. Vasa efferentia
Hair is produced by epithelial cells located in the
A. dermis. B. epidermis. C. hypodermis. D. dermis and hypodermis.
When an action potential reaches the presynaptic terminal,
A. calcium ions diffuse into the presynaptic terminal through voltage-gated ion channels. B. acetylcholine moves into the presynaptic terminal. C. a local potential is generated in the presynaptic terminal. D. ligand-gated ion channels in the presynaptic terminal are opened. E. nothing else happens.