RBC developed from red bone marrow WBC developed from red bone marrow RBC develo

Question

RBC developed from red bone marrow WBC developed from red bone marrow RBC developed from White bone marrow As we have discussed, intercalated discs (ID's) comprise the cardiac muslce cells. ID's are specialized structures connecting adjacent cells with adhering junctions, namely and junctions through which action potentials spread from one cell to another. Tight junctions and gap Desmosomes and tight Desmosomes and gap Contractile cells comprise 99% of the cardiac muscle cells and do the mechanical work of pumping. These cells do not initiate their own AP's. True False The remaining portion of the heart muscle cells are autorhythmic cells. They also contract, as well as initiate and conduct APs responsible for the contraction of the working cells. True

Explanation / Answer

31) C desmosomes and gap  

gap junctions are protein-lined tunnels, allowing transmission of the depolarizing current from cell to cell, across the chambers of the heart, so that the cells contract in unison. Cardiac muscle cells are held together during contraction by desmosomes

32 true. Contractile cells are responsible for contractile action after action potential is generated by the autorhythmic cells. They do not produce their own AP's

33) b these cells are smaller in number and create an Action potential which propagates in the heart muscle which contracts. They do not contract on their own.

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