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| Q. |
Regarding cardiac muscle: |
| A. | cardiac muscle has high ATPase activity |
| B. | only the α MHC isoform is found in the atria |
| C. | resting membrane potential is about -70mV |
| D. | force of contraction is mediated by catecholamines acting via β1 -adrenergic receptors |
| E. | mutations of the human ether-a-go-go gene causes minks to shake their legs uncontrollably |
| Answer» D. force of contraction is mediated by catecholamines acting via β1 -adrenergic receptors | |
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