If the SA node ceased to function so that the AV node became the cardiac pacemaker, the heart would be expected to: Increase (tachycardia), Decrease (bradycardia), Remain the same as normal, Increase initially but then return to normal, Stop because the AV node can't become pacemaker.
1 point Calcium ions bind to Troponin in skeletal muscle cells:
Tropomyosin, Actin, Myosin.
1 point The striations of a skeletal muscle cell are produced, for the most part, by the arrangement of myofilaments, the t-tubules, the sarcoplasmic reticulum, a difference in the thickness of the sarcolemma.
Course Cr