Cardiac muscle fibers are electrically connected to neighboring fibers by

Gap Junctions.

Explanation:

Gap junctions are intercellular channels that allows the cell transfer of molecules, ions and electric impulses.

They are connected through the protein channel and are found in many parts of vertebrate and invertebrate nervous systems.

Its most important function is to control the activities of adjacent cells.

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.

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