The problem of electrical discontinuity caused in the normal heart by the connective tissue separating the atria from the ventricles is solved by
a. having the A-V node function as a secondary pacemaker.
b. having an ectopic pacemaker.
c. coordinating electrical activity in the atria with electrical activity in the ventricles by connecting them via the vagus nerve.
d. coordinating electrical activity in the atria with electrical activity in the ventricles by connecting them via the bundle of His.
e. coordinating electrical activity in the atria with electrical activity in the ventricles by connecting them via the Purkinje fibers.
D
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An important phagocytic cell in the immune system is the:
a. B cell b. plasma cell c. neutrophil d. memory cell
Intrinsic, or local, controls are learned by an organ
a. True b. False Indicate whether the statement is true or false
A countercurrent mechanism is in
A. the afferent and efferent arterioles. B. the glomerulus and Bowman's capsule. C. the proximal and distal convoluted tubules. D. the loop of Henle only. E. both the loop of Henle and the vasa recta.
Which of the following statements correctly describes epithelial tissue?
A. Epithelial tissues allow for communication within the body by using electrical and chemical signals. B. Epithelial tissues cover and line all body surfaces including organs, vessels, and ducts. C. Epithelial tissues allow for movement of the body. D. Epithelial tissues have fibers in a matrix.