Which of the following heart tissues is not part of the internal conduction system of the heart?

A. atrioventricular bundle
B. sinoatrial node
C. semilunar valve
D. Purkinje fibers
E. atrioventricular node


Answer: C

Biology & Microbiology

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Intermediate filaments are

A) different in different cell types. B) smaller than actin filaments. C) composed of tubulin. D) composed of globular proteins only. E) none of the above

Biology & Microbiology

Explain the unique purpose of baleen plates. What trophic position do baleen whales occupy, and what advantage is it to the baleen whales to consume the diet they do?

What will be an ideal response?

Biology & Microbiology

Bone remodeling is LEAST likely to be used in ____

a. replacing old bone b. healing of injured bone c. bone growth in childhood d. blood cell formation e. calcium homeostasis

Biology & Microbiology

Which of the following correctly reflects the division of the history of life on Earth, from most inclusive to least inclusive?

A. epoch - period - era B. epoch - era - period C. era - epoch - period D. period - epoch - era E. era - period - epoch

Biology & Microbiology