MUSCLE
CARDIAC MUSCLE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
What is the sequence of events in the transmission of an impulse through the heart muscle? a:AV node b:AV bundle c:SA node d:Through the atria e:Through the ventricles f:Bundle branches g:Purkinje fibers
|
|
d, b, a, c, f, g, e
|
|
|
c, d, a, b, f, g, e
|
|
|
b, a, d, c, f, g, e
|
|
|
f, g, d, c, b, a, e
|
Explanation:
Detailed explanation-1: -The SA node (physiologicalpacemaker) starts the sequence by generating an electrical impulse, causing the atrial muscles to contract. From there, the signal travels to the AV node, then through the bundle of His, down the bundle branches, and through the Purkinje fibers, causing the ventricles to contract.
Detailed explanation-2: -These electrical impulses make the atria contract first. Then the impulses travel down to the atrioventricular (or AV) node, which acts as a kind of relay station. From here, the electrical signal travels through the right and left ventricles, making them contract.
Detailed explanation-3: -so the correct order is SA node, AV node, AV bundle, Purkinje fibres.
There is 1 question to complete.