The P wave of the electrocardiogram is a signal from
A) depolarization of the SA node.
B) depolarization of the AV node.
C) depolarization of the atria.
D) repolarization of the atria.
E) depolarization of the ventricles.
Answer: C
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A. T1; body of the sternum B. T2; body of the sternum C. T1; manubrium of the sternum D. C7; manubrium of the sternum E. T2; clavicle
Why are injections administered in the hypodermis when administering drugs using a hypodermic needle?
A) There is an abundance of capillaries in the hypodermis. B) The hypodermis is highly innervated. C) Since it is vascularized, the hypodermis can absorb a lot of fluid. D) Both elastic fibers and collagen fibers are present. E) The presence of blood vessels and lymphatic vessels help local tissues defend and repair themselves.
What is the difference between parallel and convergent evolution?
What will be an ideal response?
Ionic compounds dissociate in water into:
A) electrolytes. B) acids and bases. C) polar and nonpolar substances. D) hydrophilic and hydrophobic substances.