how that heart pumpin' ❤🩸 Flashcards
(46 cards)
what do the sa node do?
the sa node be the boss of the heart, control the atria and set the rhythm.
what’s the av node’s role?
the av node be the bouncer, delay the signal from the sa node to the ventricles.
what does the bundle of his do?
the bundle of his carry the signal from the av node down to the ventricles.
where the bundle of his at in the heart?
a medial, centralized little guy coming off of the AV node on AV node’s left side.
what’s the bundle of branches?
it splits off into left and right around the ventricles and carries the electrical signal from the bundle of his to the pukinje fibers.
what’s up with the purkinje fibers?
purkinje fibers spread the signal through the ventricles so they contract.
what happens when the bundle of his splits?
it splits into the left and right bundle of his branches for each ventricle.
how does the right bundle of his branches work?
it send signals to the right ventricle to make it pump.
how about the left bundle of his branches?
it send signals to the left ventricle so it can pump too.
why’s the av node important?
it make sure the atria finish pumping before the ventricles start.
what do the capillaries do in the lungs?
capillaries surround alveoli and carry oxygenated blood to the pulmonary venules.
how does gas exchange happen in the alveoli?
o2 moves from alveoli to blood, co2 moves from blood to alveoli.
what be the function of the pulmonary artery?
pulmonary artery carry deoxygenated blood to the lungs.
how many parts the pulmonary artery have?
the pulmonary artery split into two parts, one for each lung.
where does the pulmonary artery flow to and from?
it flows from the right ventricle to the lungs.
what about the pulmonary veins?
pulmonary veins bring oxygenated blood back to the left atrium.
how many parts the pulmonary veins have?
there be four pulmonary veins, two from each lung.
where do the pulmonary veins flow to and from?
they flow from the lungs to the left atrium.
what makes the left ventricle special?
the left ventricle be the strongest part, push blood through the aorta.
how does the sa node affect heart rate?
it set the pace, makin’ the heart beat faster or slower.
what happens if the sa node fail?
if the sa node fail, the av node take over but at a slower rate.
what triggers the sa node to fire?
sinoatrial (sa) node fires due to its own natural pacemaker activity, which is regulated by the flow of ions across the sa node cell membrane (fyi, hormones and nerves can speed it up).
how does the heart muscle contract?
the electrical signals cause muscle fibers to shorten, pumpin’ the blood.
why are the bundle of branches important?
they ensure both ventricles contract at the same time, pumpin’ blood together.
