At an intercalated disc, at an intercalated disc, the cell membranes of two cardiac muscle fibers are completely separated by a synapse. two cardiac muscle cells are connected by gap junctions. t-tubules unite the membranes of the adjoining cells. the myofibrils are loosely attached to the membrane of the disc. all of the answers are correct.

This is a typical grassland food web. it is also a small picture of an important cycle on earth: the carbon cycle. describe how the carbon gets into this food web. a) bacteria and fungi, the decomposers, recycle carbon from dead organisms. b) carbon is found in the grass and is passed from one level to the next in this food web. eliminate c) all living things give off carbon dioxide as a by-product of respiration and it is released into the atmosphere. d) plants use carbon dioxide as a reactant in photosynthesis, to make usable chemical energy in the form of a sugar.