Fill in the Blank QuestionFill in the blank question.The portion of the cardiac conduction system located in the right atrium near the opening of the superior vena cava is the .

Blood from the superior and inferior vena cavae and the coronary sinus flow into the ______.Multiple choice question.right atriumsystemic circuitaortaleft atrium

Which heart chamber is connected to (and receives blood from) the superior and inferior venae cavae?Multiple choice question.Left ventricleLeft atriumRight atriumRight ventricle

Multiple Choice QuestionWhere is the SA node located?Multiple choice question.interatrial septum near the ventriclesinterventricular septum between the ventriclesright atrium near the superior vena cava openingleft atrium near the pulmonary arteries openings

Chambers of the heart RIGHT ATRIUM • general features: thin-walled chamber that lies superior to the right ventricle; receives blood from the systemic blood circuit; • orifice of the superior vena cava: located in the superior region of the right atrium; • orifice of the inferior vena cava: located in the inferior region of the right atrium; backflow of blood is prevented by the presence of the Eustachian valve; • auricle of the right atrium: ear-shaped pouch/extension of the right atrium; projects to the left from the root of the superior vena cava; • pectinate muscles: also called musculi pectinati; parallel muscular ridges on the internal wall of the majority of the right atrium and the right auricle; • interatrial septum: partition between the ___________________________ and the ________________________________; • fossa ovalis: shallow depression in the interatrial septum; remnant of the foetal _________________________________; • coronary sinus opening: located internally in the wall of the right atrium; lies between the orifice of the inferior vena cava and the right atrioventricular opening; receives all blood draining from the heart itself; protected by a semilunar fold of the endothelium of the heart called the coronary valve

The part of the cardiac conduction system that excites contraction of the interventricular septum is the ________________.