A&PII Chapter 18 part 1

[@YadiAlamin]

Dr Parker's vocal tone, participation questions and repetition make this great!

[@janettex08]

Thanks to you, I aced my first quiz!!!! I had been getting B’s but your lectures help me grasp a good understanding of how the body functions.

[@Don-eg7dp]

You are a lifesaver. Thank you.

[@aisham3312]

Finally got a hang of the blood circulation path. Thank you!!!

[@Bilbus7]

I can't believe I failed this class the first time. After putting in some effort and watching these videos, I ended up with a solid A and could not feel better. Thank you so much for recording these lectures for everyone.

[@Bilbus7]

@Callum Ismael bots

[@beckywestley7461]

Great info!

[@ZeBrain1]

Dr.. Parker where is part 2 and or 3 of the cardiovascular system? Super helpful!

[@CardiacRn333]

Love Dr Parker's online lectures!

[@shanmugalingamshrikharan2056]

small error in my previous comment in line 4 where I mentioned: Na influx into the myocardial conducting cells and repolarization mainly due to K getting into the cell. The correction should read Na influx into the myocardial conducting cells and repolarization mainly due to K getting out of the cell.

[@shartaribrown987]

i love her videos ; however, i want to point out that a pacemaker does NOT shock you ever,that device is called a ICD. now you can have a pacer/ICD meaning it does both pace the heart and shock if needed

[@Bilbus7]

Then what does this mean? If your heart rhythm is abnormal, the computer will direct the generator to send electrical pulses to your heart. The pulses travel through the wires to reach your heart (www.nhlbi.nih.gov/health-topics/pacemakers)

[@Kay-Naani]

I hope someone can answer this because i am a little bit confused but if the arteries take blood away from the heart how does the heart get its oxygen from the left coronary artery? I'm not understanding because it just makes more sense for the veins to give the heart everything it would need since it's job is to carry the blood to the heart.

[@trinaanderson3440]

In the pulmonary circuit, it is opposite. between the heart and lungs

[@kayleidunn6056]

Veins are usually carrying deoxygenated blood which is why it doesn’t make sense for the heart to receive oxygen from the veins instead of the arteries. Most importantly, the coronary vessels are a part of their own separate system (coronary circulation) The heart receives oxygen from the left coronary artery, which is just a tiny branch-off from the aorta. Since that artery is branching off, and coming from the aorta, the blood that’s being pushed through is oxygenated because it has already traveled through the pulmonary circuit , and is now supplying the heart with oxygen. The coronary veins pick up the deoxygenated blood and empty it into the coronary sinus which just drains the blood right back into the atrium to start that same process over. So the whole “arteries=away and veins=to” idea doesn’t apply to the coronary circulation or the pulmonary circulation, it’s really just the systemic circulation that abides by that saying.

[@shanmugalingamshrikharan2056]

Firstly I must thank you for the videos. But I should also point certain omissions related to action potential generated by the cardiac conducting cells. You mention depolarization is due to Na influx into the myocardial conducting cells and repolarization mainly due to K getting into the cell. Ca influx serves another purpose. But I am not sure, I feel something important is missing and I am mainly talking through what I think is common sense. As a final step, before the next action potential Na should get out of the cell and K should get into the cell as well as the calcium that leaked inside should leave out to maintain ionic normalcy. You have not mentioned this. Otherwise with each and every action potential the conducting cell will get loaded with excess of Na and calcium and depleted of K and in a short time after birth cardiac conducting system will stop functioning and we have to die! So there should be another phase too so ionic equilibrium within and outside could be restored. You are not alone and I have watched other videos in KZbin and no one ever mentions how Na and K balance is restored! I hope you have caught my point

[@cherswitzer5145]

I would like to print these pictures to study, how can I do that? Your lecture notes are much easier to study

[@yeonjung8744]

where is reproductive system?? i can't find it ...