Cardiomyocytes are similar to skeletal muscle because:
they beat involuntarily
they are used for weight lifting
they pulse rhythmically
they are striated

they are striated

Explanation:

The skeletal muscle is controlled at will through the somatic nervous system. Most of it is attached to bones, that allow us to move the bones and lift objects. Also, the skeletal muscle is a form of striated muscle.

The cardiomyocytes are the cells that form the cardiac muscle, also a type of striated muscle tissue. In contrast with the skeletal muscle, cardiac muscle is an involuntary muscle that contracts by the electrical stimulation created by cells of the sinoatrial node.

In conclusion, their similitude is being a type of striated muscle.

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!

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