The condition known as atrial septal defect is characterized by the presence of

Question

The condition known as atrial septal defect is characterized by the presence of a hole in the interatrial septum. How blood? this condition affect the normal pattern of blood flow? What effect would this have on the oxygenation of the 6 Skeletal muscle cells contract is proportional to the strength of muscle contraction needed. In this way, we activate a few fibers to produce a small contraction to pick up a piece of paper, and we activate many fibers to produce a larger contraction to pick up exhibit a phenomenon known as recruitment, in which the number of muscle cells recruited to a textbook Would you expect to see recruitment in cardiac muscle tissue? Why or why not? 390 Exploring Anatomy in the Laboratory

Explanation / Answer

5. An ASD is a defect in the septum between the left and right atria leading to a left-to-right shunt.

ostium secundum ASD. The anomaly is caused by a defect in the floor of the fossa ovalis,resulting in failure of the septum secundum to develop completely and cover the foramen ovale. Secundum defects are usually asymptomatic in childhood   

In ostium primum ASD the anomaly is a form of partial atrioventricular canal defect or endocardial cushion defect. The abnormalities are confined to the atrial septum and are caused by the endocardial cushions failing to develop and so close the ostium primum part of the interatrial septum. The defect is associated with abnormalities of the mitral valve, leading to mitral regurgitation.

A sinus venosus ASD is a rare defect and is the result of failure of partition of the pulmonary and systemic venous circulations. These defects are most commonly located high in the atrial septum at the junction of the superior vena cava and the right atrium. They are frequently associated with anomalous pulmonary venous drainage with right superior pulmonary veins draining into the superior vena cava or right atrium directly

6.Cardiac muscle is already fully recruited. Essentially, the heart can be considered analogous to one giant motor unit, whose contractile activity is initiated by the sino-atrial (SA) node

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