★ Physiology Quiz
Which statement regarding the sinoatrial node is TRUE?
A. it is innervated by the vagal nerve
B. SA node reaches threshold faster than other heart structures
C. is located in the right atrial wall near the opening of the superior vena cava
D. it does not have a stable resting potential
E. all of the answers
Select your answer:
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Nervous / Sensory System › ViewThe optic nerve has a covering that helps protect and insulate it called the
A. muscle fiber
B. fat layer
C. myelin sheath
D. trash bag
Genetics › View
Alleles are different forms of a single _________.
A. Genotype
B. Phenotype
C. Gene
D. Trait