A possible explanation for the effect of caffeine is that it blocks the receptor for a neuromodulator in the brain called ________, which inhibits ACh release by cholinergic neurons.
A. adenosine
B. serotonin
C. melatonin
D. glycine
E. dopamine
Answer: A
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Action potentials are conducted into a skeletal muscle fiber by
A) Motor end plates. B) Neuromuscular junctions. C) Transverse tubules. D) Triads. E) Sarcoplasmic reticulum
Explain how the ionic compound sodium chloride dissolves in water
A) The positive poles of water molecules are attracted to the negatively charged chloride ions, and the negative poles of water molecules are attracted to the positively charged sodium ions. B) The positive poles of water molecules are attracted to the positively charged chloride ions, and the negative poles of water molecules are attracted to the negatively charged sodium ions. C) The negative poles of water molecules are attracted to the negatively charged chloride ions, and the positive poles of water molecules are attracted to the positively charged sodium ions. D) The negative poles of water molecules are attracted to the positively charged chloride ions, and the positive poles of water molecules are attracted to the negatively charged sodium ions. E) Sodium chloride is hydrophobic so it does not dissolve in water.
________ happens in the cytoplasm, whereas ________ happens in the mitochondrion
A) Aerobic respiration; anaerobic fermentation B) Glycolysis; pyruvic acid reduction C) Anaerobic fermentation; glycolysis D) The citric acid (Krebs) cycle; mitochondrial electron-transport E) Glycolysis; the citric acid (Krebs) cycle