How do the differences between cardiac muscle cells and skeletal muscle cells make cardiac muscle more suitable for pumping blood?

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.