ANATOMY
CHEST AND CARDIOVASCULAR
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
The group of pacemaker cells near the entrance of the superior vena cava forms the ____
|
|
Sinoatrial node
|
|
|
Bundle of his
|
|
|
atrioventricular node
|
|
|
myocardium
|
Explanation:
Detailed explanation-1: -It is located at the junction of the crista terminalis in the upper wall of the right atrium and the opening of the superior vena cava. These cells have the ability to spontaneous generate an electrical impulse. It is the integrated activity of these so-called pacemaker cells that form the SA node.
Detailed explanation-2: -The SA (sinoatrial) node generates an electrical signal that causes the upper heart chambers (atria) to contract. The signal then passes through the AV (atrioventricular) node to the lower heart chambers (ventricles), causing them to contract, or pump. The SA node is considered the pacemaker of the heart.
There is 1 question to complete.