Which of the following carries no electrical charge?
a. proton
b. neutron
c. electron
d. both proton and neutron
b. neutron
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What is the relationship between ions and myelin that prevents ions from passing through channels?
A) Size: Ions are large in diameter and myelin is much smaller. B) Electrical: Ions have negative charges and myelin have positive charges. C) Solubility: Ions are water soluble and myelin is a lipid. D) Weight: Ions are light and myelin is much heavier.
During one cardiac cycle the ventricles spend most of their time in
A) diastole. B) contraction. C) fibrillation. D) systole. E) None of the answers are correct.
Chemical digestion of ____________________ is initiated by the secretion of saliva.?
Fill in the blank(s) with correct word
Summarize the two phases of the cardiac cycle during which all four heart valves are briefly closed
What will be an ideal response?