In a normal ECG, the deflection that is generated by ventricular repolarization is called the ________.
A. T wave
B. P wave
C. R wave
D. S wave
E. QRS wave
Answer: A
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About how many cells constitute the body of an adult?
A. 50 to 100 quadrillion B. 50 to 100 billion C. 50 to 100 million D. 50 to 100 trillion
What happens when two or more overlapping action potentials are "added" together within a muscle?
a. twitch fatigue b. twitch summation c. contraction addition d. contraction paralysis e. sarcoplasmic reduction
Hypertension is commonly considered to be a chronic resting blood pressure higher than ________.
A. 130/60 B. 140/90 C. 200/90 D. 180/90 E. 120/75
Most transmembrane proteins have ________ regions facing the intra- and extracellular fluid, and ________ regions embedded in the phospholipid bilayer.
A. hydrophilic; hydrophilic B. hydrophobic; hydrophilic C. hydrophilic; hydrophobic D. hydrophobic; hydrophobic E. lipophilic; lipophobic