The loudest sounds a nurse hears while listening to a patient's heart through a stethoscope are caused by
A. depolarization of the ventricles.
B. contraction of the ventricles.
C. opening of the semilunar valves.
D. contraction of the atria.
E. closing of the AV valves.
Answer: E
You might also like to view...
The heart in a human embryo begins to beat about ____ after fertilization
a. 5 days b. 3 weeks c. 7 weeks d. 9 weeks e. 12 weeks
The concept that a set of three nucleotides specifies a particular amino acid provides the basis for
A) the one-gene-one-enzyme hypothesis. B) the one-gene-one-polypeptide hypothesis. C) the genetic code. D) biochemical reactions among nucleic acids. E) All of these
Allergic patients receiving small, controlled injections of specific allergens are undergoing ________.
A. degranulation B. desensitization C. tissue matching D. sensitization
Which of the following structures allows a cell to survive adverse environmental conditions?
a) Capsule b) Carboxysome c) Endospore d) Gas vacuole