Which of the following is not part of the cardiac conduction system?
A) Atrioventricular (AV) bundle (bundle of His)
B) Tendinous cords
C) Sinoatrial (SA) node
D) Atrioventricular (AV) node
E) Purkinje fibers
B
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Blood is distributed from the surface of a bone to deeper central canals through channels known as
A) perforating canals. B) canaliculi. C) interstitial canals. D) concentric ducts. E) concentric canals.
Most human cells range from 10 to 15 micrometers in diameter. What limits how large a cell can get?
A. The relationship between its length and surface area B. A cell's lifespan C. Nutrients available in the environment of a cell D. The relationship between its volume and surface area E. The relationship between its volume and length
The chordae tendinae of the AV valves are anchored to the ________ of the ventricles
A) pectinate muscles B) interatrial septum C) trabeculae carnae D) interventricular septum E) papillary muscles
A gene is
A. a DNA sequence that contains the information for producing one type of protein. B. the collection of all of the protein-encoding DNA sequences on a particular chromosome. C. an amino acid sequence that contains the information for producing a particular DNA sequence. D. a structure that contains chromosomes.