Exam (elaborations)
NURS6902 EXAM 2 LATEST UPDATED
- Course
- Institution
NURS6902 EXAM 2 LATEST UPDATED...
[Show more]
Content preview
NURS6902 EXAM 2 LATEST UPDATEDblood flow through the heart - ANSWER 1-Superior & Inferior Vena Cava, 2-Rt
Atrium, 3-Tricuspid Valve, 4- Rt Ventricle, 5-Pulmonary Valve, 6-Pulmonary
Artery, 7- Lungs-pick up oxygen, 8-Pulmonary Veins, 9- Lt Atrium, 10- Mitral
Valve (Bicuspid), 11-Lt Ventricle, 12- Aortic Valve, 13-Aorta, 14- Body
cardiac myocytes - ANSWER specialized muscle cells
action potential - ANSWER contraction of these cells initiated by electrical
impulses
SA node - ANSWER primary pacemaker of the heart; initiates all heartbeats and
controls heart rate, fire spontaneously generating action potentials that spread
through contractile myocytes of atria.
AV node - ANSWER impulses sent from SA node, to AV node, slow down a little
to allow the atria to contract, then follow the conduction pathway and spread
through the ventricular myocytes.
3 major uses for action potential - ANSWER K - inside cell
Na - outside cell
Ca - outside cell
- resting membrane potential = (-) on the inside
- maintained by pumps Na, Ca and K channels
depolarization - ANSWER action potential begins with the voltage becoming more
positive. Mainly due to opening of sodium channels that allow Na to flow into the
cell
absolute refractory period - ANSWER after a delay; termination of action potential
occurs
repolarization - ANSWER Potassium channels open, allowing K to leave the cell
and causing the membrane potential to return to negative
,AV bundle ( bundle of HIS) - ANSWER divided into right and left bundle branches
which conduct the impulses toward the apex of the heart
purkinje fibers - ANSWER apex of the heart
P wave - ANSWER SA node fires, electrical signals spread throughout the atria
and cause the atrial to depolarize
PR segment - ANSWER the time signals travel from the SA node to the AV node
QRS complex - ANSWER marks the firing of the SA node to the AV node and
represents ventricular depolarization; atrial repolarization.
Q wave - ANSWER depolarization of the interventricular septum
R wave - ANSWER depolarization of the main mass of the ventricles
S wave - ANSWER last wave of ventricular depolarization at base of the heart
ST segment - ANSWER reflects the plateau in the myocardial action potential,
ventricles contract and pump blood
T wave - ANSWER ventricular repolarization. immediately before ventricular
relaxation of ventricular diastole
aorta - ANSWER rich in oxygenated blood
right coronary artery - ANSWER right descending artery - acute marginal artery
- will supply right atrium and right ventricle and cytoatria ventricular nodes, which
are the conduction systems of the heart
left coronary artery - ANSWER left anterior descending artery and the circumflex
artery
- will supply blood to the left atrium and left ventricle
veins (in coronary blood flow) - ANSWER will leave cardiac muscle cells and will
bring the deoxygenated blood back to the right atrium through the coronary sinus
small cardiac vein - ANSWER from right side joining with coronary sinus
middle cardiac vein - ANSWER from right ventricle joining coronary sinus
, posterior vein - ANSWER from left ventricle joining into coronary sinus bringing
back deoxygenated blood to the right atrium
great cardiac vein - ANSWER comes from front of heart
anterior vein - ANSWER does not join onto the coronary sinus but drains blood
directly to right atrium
endocardium - ANSWER - inter most layer of cardiac wall
- loose connective tissue and simple squamous epithelial tissue
- (simple squamous epithelial tissue)
- regulates contractions
subendocardial layer - ANSWER - lies between the endocardium and myocardium
(2nd innner)
- containing the vessels and nerves of the conducting system of the heart. The
purkinje fibers are located in this layer
- damage to this layer can result in various arrhythmias
myocardium - ANSWER - 2nd to outer layer
- main constituent of the heart and the thickest layer of all 3 layers
- it is a muscle layer that enables heart contractions
- have a single nucleus in the center of the cell
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Boostertips. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
72042 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now