Given the following components of the cardiac conduction cycle, which one of the following best describes the movement of the stimulus that causes a heart contraction? A. atrioventricular bundle B. sinoatrial node C. atria D
atrioventricular node E. Purkinje fibers F. ventricles A) B, C, D, A, E, F
B) B, D, A, C, E, F
C) D, A, E, F, B, C
D) A, D, E, B, C, F
E) B, C, D, F, A, E
A
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Amino acids, fatty acids, sugars, and nucleotides are produced during which metabolic reaction?
a. Fueling b. Biosynthesis c. Polymerization d. Assembly
Plasmodesmata are cell junctions that are similar in
function to a. gap junctions in animal cells. b. tight junctions in animal cells. c. adhering junctions in animal cells. d. the cuticle in plant cells. e. stomata in plant cells.
Why do the cells die when the ambient temperature drops to freezing?
a. because of the increased cellular signalling inside the cell b. because of the inhibition of cell division c. because of the inhibition of molecule transport across the cell membrane d. because of the increased metabolic reactions inside the cell
Modern birds are probably direct descendants of:
A) dinosaurs. B) marsupials. C) iguanas. D) crocodiles.