Electrical excitation for heart contraction originates in the ________ .
a. atrioventricular (AV) node
b. Purkinje fibers
c. intercalated disc
d. sinoatrial (SA) node
e. cardiac muscle cells
d. sinoatrial (SA) node
You might also like to view...
The most common DNA-binding motif is the
A. non-helical zipper. B. leucine zipper. C. zinc finger. D. homeodomain. E. helix-turn-helix.
Crossing over is partially responsible for our genetic diversity
a. True b. False Indicate whether the statement is true or false
Gram-negative bacteria are less susceptible to complement lysis than Gram-positive bacteria
Indicate whether this statement is true or false.
What is one cause for the 21,000 protein encoding sequences in the human genome producing between 200,000 and 1 million different proteins?
A) SNPs B) CRISPR-Cas systems C) alternative splicing D) CNVs E) restriction enzymes