Action potentials are relayed from the lower part of the atrium (AV node) through the Bundle of His to the lower part of the venticle. This serves to:
A) ensure that the entire heart is stimulated simultaneously.
B) excite the venticles before the atria.
C) ensure adequate separation of atrial and ventricular contraction, producing a wavelike contraction.
Answer: B) excite the venticles before the atria.
You might also like to view...
In fetal development, hemocytoblasts begin to colonize red mone marrow at approximately
A. 10 days. B. 10 weeks. C. 5 months. D. 8 months.
T cells:
a. spend time developing in the thymus b. are responsible for cell-mediated immunity c. respond to antigens by releasing antibodies d. both A and B above
In this activity, the stimulus voltage used was _______.
A) suprathreshold for all of the axons B) altered to accommodate the structural differences C) the same for all of the axons D) the same for all of the axons and suprathreshold for all of the axons
Which of the following is not a function of the liver?
A. Glycogenesis B. Phagocytosis C. Secretion of digestive enzymes D. Synthesis of plasma proteins E. Detoxification