Title. I have skimmed through the first page of Google, and haven't found anything on exactly how the electrical impulses are produced. Not the best way for finding answers, hence why I'm here.
Is it a chemical reaction or is it just not researched enough?
Thanks for the help guys
I have in my OLD notes hypothalmus but the only thing I can find on this is things that say connected to medulla oblongada, not sure which one is right. If it is connected to the medulla, does the hypothalmus then somehow affect it?
Some clarification: I looked up a few things to determine this, but the most I've gotten is that once X threshold has been reached for hyer/de-polarization, the node reacts appropriately. But I was wondering: is there any input into this pump/receive/pump/receive system from stretch receptors in the heart muscle, or maybe in the pericardium? Such that when X level of stretch reception and processing occurs (e.g. at ventricle capacity), that at least provides -input- into "telling" the ventricle to pump?
If I understand correctly, the sinoatrial node is sort of like a natural pacemaker that generates an electrical impulse and stimulates the heartbeat. I read that even if you separate the heart from the brain, the heart can keep on beating because of the SA node. What is the reason that, for example, in the case of a fatal brain aneurism the heart stops working? Or a broken neck, traumatic head injury, or any number of other things that can kill someone without physically damaging the heart or causing huge amounts of blood loss. Why does the SA node stop stimulating heartbeat in these cases? Am I just misunderstanding the concept?
Moderna covid vaccine side effects:
Abdominal discomfort: 1,435 reports
Abdominal distension: 341 reports
Abdominal pain: 1,502 reports
Abdominal pain lower: 164 reports
Abdominal pain upper: 1,626 reports
Abnormal behavior: 114 reports
Abnormal dreams: 130 reports
Abortion spontaneous (naturally occurring miscarriage): 232 reports
Acute myocardial infarction (acute heart attack): 193 reports
Acute respiratory failure: 143 reports
Adverse reaction: 138 reports
Ageusia (loss of taste functions of the tongue): 733 reports
Agitation (state of anxiety or nervous excitement): 415 reports
Alanine aminotransferase increased: 170 reports
Anaemia (lack of blood): 125 reports
Anaphylaxis (serious allergic reaction that is rapid in onset and may cause death): 606 reports
Angioedema (rapid swelling of the dermis): 294 reports
Anticoagulant therapy: 311 reports
Aphonia (inability to produce voice): 103 reports
Appendicitis (inflammation of the appendix): 118 reports
Appetite - decreased (decreased appetite occurs when you have a reduced desire to eat): 3,463 reports
Arrhythmias (irregular heartbeat): 1,703 reports
Arthritis (form of joint disorder that involves inflammation of one or more joints): 250 reports
Aspartate aminotransferase increased: 160 reports
Asthma: 373 reports
Atrial fibrillation/flutter (atrial fibrillation and flutter are abnormal heart rhythms in which the atria, or upper chambers of the heart, are out of sync with the ventricles): 544 reports
Axillary mass: 148 reports
Axillary pain: 1,561 reports
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Bedridden: 116 reports
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Breathing - slowed or sto
... keep reading on reddit ➡In October 1958, the 43 year old engineer Arne Larsson lay dying in a hospital bed. He was suffering from Adams-Stokes syndrome, due to third degree atrioventricular block.
This means that the electrical signals generated by the sinoatrial node, which normally regulates the pace of the heart, cannot travel throughout the heart to cause a coordinated contraction. Because of their important role, the cells of the sinoatrial node are known as pacemaker cells. When their signals cannot travel throughout the heart, other cells take over the role of pacemaker cells, typically resulting in an extremely slow pulse. This in turn causes Adams-Stokes syndrome, characterized by frequent fainting without warning. The condition is serious; if left untreated, there is a 50% risk of death within one year from the first attack.
Arne Larsson’s disease had progressed to a stage where his pulse would regularly plummet down to 20, and he fell unconscious about 30 times a day. He had been hospitalized for 6 months and his condition was considered hopeless.
As a desperate measure, Larsson’s wife Else Marie called the heart surgeon Åke Senning. She had read a newspaper article about Senning’s experiments with cardiac pacing in dogs, and asked him to use this technology on her husband.
Artificial pacemakers had already existed for a few decades, but they had all been large and clunky, which made it impossible to implant them inside the body. This in turn necessitated running wires from the machine, through the chest wall and to the heart. The risk of infection is obvious, and the quality of life for the patient was limited.
In 1957, the American surgeon Lillehei’s team had developed a pacemaker small enough to be worn on the patient’s belt, using batteries and the recently invented transistor. This pacemaker still had the substantial disadvantage of being external to the body.
Åke Senning decided to develop an entirely implantable device. He joined forces with Rune Elmqvist, a medical doctor who was also a self-taught engineer and inventor. Together they developed a pacemaker small enough to implant. It was very primitive by modern standards; the schematic is so simple, that anyone who owns a soldering iron could assemble it at the kitchen table.
Schematic of the first implantable pacemaker
Apart from two transistors, a few diodes and capacito
... keep reading on reddit ➡Interestingly, if you separate the heart from input from the brain, it will tend to beat faster.
The brain doesn’t cause the heart to beat; it only influences how quickly and strongly it beats.
The brain sends signals through the autonomic nervous system. The parasympathetic system slows the conduction through the heart and decreases heart rate. The sympathetic system decreases the time spent in relaxation, and thus increases heart rate; it also causes the force of contraction to increase.
Normally, the tone of the parasympathetic system is dominate.
What causes the healthy heart to contract is the rhythmic electrical firing of a group of cell, called P cells of the sinoatrial (SA) node.
These cells have an intrinsic rate of fire. Under only its own mechanisms, the SA node fires at a rate of about 100 beats per minute.
Since the parasympathetic system is dominate, the heart rate tends to be lower than 100 bpm (resting heart rate is typically around 60 bpm, but can be lower).
If the influence from the brain were removed, the heart would tend to be faster, as this parasympathetic dominance is removed; and the intrinsic rate of the SA node will predominate.
Just a random thing I think about from time to time.
I don't want to step on anybody's toes here, but the amount of non-dad jokes here in this subreddit really annoys me. First of all, dad jokes CAN be NSFW, it clearly says so in the sub rules. Secondly, it doesn't automatically make it a dad joke if it's from a conversation between you and your child. Most importantly, the jokes that your CHILDREN tell YOU are not dad jokes. The point of a dad joke is that it's so cheesy only a dad who's trying to be funny would make such a joke. That's it. They are stupid plays on words, lame puns and so on. There has to be a clever pun or wordplay for it to be considered a dad joke.
Again, to all the fellow dads, I apologise if I'm sounding too harsh. But I just needed to get it off my chest.
I guess the concept didn't work
Alot of great jokes get posted here! However just because you have a joke, doesn't mean it's a dad joke.
THIS IS NOT ABOUT NSFW, THIS IS ABOUT LONG JOKES, BLONDE JOKES, SEXUAL JOKES, KNOCK KNOCK JOKES, POLITICAL JOKES, ETC BEING POSTED IN A DAD JOKE SUB
Try telling these sexual jokes that get posted here, to your kid and see how your spouse likes it.. if that goes well, Try telling one of your friends kid about your sex life being like Coca cola, first it was normal, than light and now zero , and see if the parents are OK with you telling their kid the "dad joke"
I'm not even referencing the NSFW, I'm saying Dad jokes are corny, and sometimes painful, not sexual
So check out r/jokes for all types of jokes
r/unclejokes for dirty jokes
r/3amjokes for real weird and alot of OC
r/cleandadjokes If your really sick of seeing not dad jokes in r/dadjokes
Punchline !
Edit: this is not a post about NSFW , This is about jokes, knock knock jokes, blonde jokes, political jokes etc being posted in a dad joke sub
Edit 2: don't touch the thermostat
Do your worst!
How the hell am I suppose to know when it’s raining in Sweden?
Ants don’t even have the concept fathers, let alone a good dad joke. Keep r/ants out of my r/dadjokes.
But no, seriously. I understand rule 7 is great to have intelligent discussion, but sometimes it feels like 1 in 10 posts here is someone getting upset about the jokes on this sub. Let the mods deal with it, they regulate the sub.
They were cooked in Greece.
I'm surprised it hasn't decade.
Now that I listen to albums, I hardly ever leave the house.
He lost May
Two muffins are in an oven, one muffin looks at the other and says "is it just me, or is it hot in here?"
Then the other muffin says "AHH, TALKING MUFFIN!!!"
Don't you know a good pun is its own reword?
For context I'm a Refuse Driver (Garbage man) & today I was on food waste. After I'd tipped I was checking the wagon for any defects when I spotted a lone pea balanced on the lifts.
I said "hey look, an escaPEA"
No one near me but it didn't half make me laugh for a good hour or so!
Edit: I can't believe how much this has blown up. Thank you everyone I've had a blast reading through the replies 😂
It really does, I swear!
And now I’m cannelloni
Because she wanted to see the task manager.
But that’s comparing apples to oranges
And boy are my arms legs.
Put it on my bill
Heard they've been doing some shady business.
but then I remembered it was ground this morning.
Edit: Thank you guys for the awards, they're much nicer than the cardboard sleeve I've been using and reassures me that my jokes aren't stale
Edit 2: I have already been made aware that Men In Black 3 has told a version of this joke before. If the joke is not new to you, please enjoy any of the single origin puns in the comments
They’re on standbi
