What best explains excitability properties of cardiac cells

Explanation:

Excitability of a cardiac cell describes the ease with which the cell responds to a stimulus with a regenerative action potential.The more negative the Em, the more Na+ channels are available for activation, the greater the influx of Na+ into the cell during phase 0, and the greater the conduction velocity.

answer: grassland biomes are closer to the equator and receive more rain.

grasslands are biomes that are dominated by grasses rather shrubs and trees. savanna are biomes that exhibit grasses, shrubs and small tree as vegetation. grasslands are located near the equator of the earth. these are found in north america. savanna biomes are found in africa, south america, australia and india. grassland exhibit moderate climatic conditions, it receives   amount of rainfall higher than savanna.   therefore, savanna exhibit dry and hot climatic conditions.