Most fevers are the body's way of ________.
A. killing all pathogens
B. breaking up the cells of pathogens
C. making an inhospitable environment for pathogens to survive
D. preventing pathogens from reproducing
Answer: C
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When a membrane is stimulated due to opening of chemically-gated Na+ channels
a. an impulse is propagated. b. a graded potential is established. c. an action potential is inhibited d. the voltage across the membrane becomes more negative. e. the voltage across the membrane stays the same.
If there is a complete block between the SA node and the AV node, how would the ECG be affected?
A) The P-R interval will be shorter. B) The QRS duration will be longer. C) There will be much bigger P waves. D) The ventricles will stop beating. E) The rate of P waves will be faster than the rate of QRS complexes.
As a venous pathway moves closer to the heart, the veins
A. get larger. B. get smaller. C. show no change in their lumen size.
Which phase of the menstrual cycle is the one associated with menstrual cramps?
A) Follicular B) Secretory C) Proliferative D) Luteal E) Premenstrual