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Hw6 Unit 4

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Words 388
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Kayla Martinez
5/16/15
HW6
1. (3 pts) What are intercalated discs in cardiac muscle? What is the functional importance of these in the heart? Intercalated discs are important because they have desmosomes that hold the cell together, and also gap junctions that allow ions to pass through. These all currents to travel through cardiac muscle.
2. (2 pts) Define systole and diastole. Which heart chambers are usually referenced when these terms are used?
Systole is the contraction while Diastole is the relax state of the muscle. They are referenced with the ventricles. Systole is the amount of blood after contraction and diastole is the amount of blood after relaxation inside the ventricles.
3. (4 pts) In an infant, what is ductus arteriosus? What

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