The most common neurotransmitter in the brain is ________.
A. serotonin
B. GABA
C. acetylcholine
D. glycine
Answer: B
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Which two types of neuroglial cells produce myelin?
A. Ependymal cells and Schwann cells B. Oligodendrocytes and Schwann cells C. Microglia and satellite cells D. Oligodendrocytes and astrocytes
What is tubular reabsorption?
A. The process where the nephron returns water and some filtered molecules to the blood. B. The reabsorption of blood cells in the nephron into the body. C. The passage of water and ions into the filtrate during filtration in the nephron. D. The absorption of proteins into the filtrate which later becomes urine. E. The transport additional solutes from the blood into the filtrate by tubule cells.
In an ECG, the QRS complex represents
A. depolarization of the atria. B. depolarization of the ventricles. C. repolarization of the atria. D. repolarization of the ventricles.