Exam (elaborations)
BIO 245 Heart Test 2 Klesath
BIO 245 Heart Test 2 Klesath
[Show more]
Seller
Follow
Content preview
BIO 245 Heart Test 2 Klesath1. Depolarization - ANS-Fast voltage gated Na channel opens; Na influx
Reversal of Polarity
1.Reaching threshold - ANS-slow voltage-gated Na channels open. Inflow of Na
changes membrane potential from -60mV to -40mV
2. Plateau - ANS-Voltage-gated K channels open; K efflux
Slow voltage gated Ca channels open Ca influx
Depolarization Maintained
2.Depolarization - ANS-Fast voltage-gated Ca channels open. Inflow of Ca changes
membrane potential from -40mV to just about +10mV
3. Repolarization - ANS-Voltage-gated Ca channels close
Voltage-gated K channels remain open; K efflux
Reversal of Polarity; from positive to back to negative
3.Repolarization - ANS-Fast voltage-gated Ca channels close. Voltage-gated K
channels open allowing K outflow. Membrane potential returns to RMP -60mV, and K
channels close
Afterload - ANS--resistance in arteries to ejection of blood
-inversely/negatively correlated with stroke volume
-represents how hard the ventricles must work to eject blood
Angioplasty - ANS-procedure that opens narrowed or blocked coronary arteries through
a balloon catheter or by inserting an expandable metal mesh tube (stent)
Aorta - ANS-transports oxygenated blood from the left ventricle to the systematic
tissues
Artery - ANS-carries blood away from the heart
Atherosclerosis - ANS-is the deposition of plaque on the inner lining of arteries,
decreases the diameter of artery, increasing the resistance and afterload, therefore
decreasing stroke volume
, Atria - ANS-receiving chambers where great veins attach
-separated by interatrial septum
-interior contains pectinate muscles composed of parallel ridges
Atria Contraction - ANS-compresses wall of chambers to move blood into ventricles
narrows heart
Atrial Systole - ANS--Atria contract and ventricles relax
-AV valves open and SL valves closed
Autorhythmic - ANS-do not require stimulation
do not have stable RMP
RMP gradually increasing to threshold without stimulation
depolarization occurs with entrance of Ca into cells
AV bundle - ANS-conducts the action potential along the left and right bundle branches
to the Purkinje fibers
AV node - ANS-The action potential from the SA node travels here where it is delayed
before passing to the AV bundle within the interventricular septum
Bradycardia - ANS--persistently low resting heart rate in adults (<60 bpm)
-normal change in athletes, abnormally due to: hypothyroidism, electrolyte imbalance,
and congestive heart failure
Capillaries - ANS--exchange with systematic cells
-exchange with air sacs in the lungs
Cardiac Muscle Cells - ANS--Action potentials initiated by conduction system (nodal
cells) pass to myocytes through gap juntions
-action potentials travel from muscle cell to muscle cell through gap junctions at
intercalated discs allowing the muscle tissue to act as function suncytsium
-Electrical signal ultimately causes calcium to be released inside the cell triggering the
interaction of contractile proteins
Cardiac Muscle Fibers - ANS--cardiac muscle fibers
-short, branched cells that are interconnected allowing cells to contract together in a
wavelike pattern
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 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 modockochieng06. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £6.52. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
77254 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now