<Tr> <Td> Mitochondria </Td> <Td> few </Td> <Td> numerous </Td> <Td> many to few (by type) </Td> </Tr> <Tr> <Td> Nuclei </Td> <Td> </Td> <Td> </Td> <Td>> 1 </Td> </Tr> <Tr> <Td> Sarcomeres </Td> <Td> none </Td> <Td> present, max. length 2.6 μm </Td> <Td> present, max. length 3.7 μm </Td> </Tr> <Tr> <Td> Syncytium </Td> <Td> none (independent cells) </Td> <Td> none (but functional as such) </Td> <Td> present </Td> </Tr>

Which type of muscle cells show rhythmic contraction