Cardiac Conduction System and Understanding ECG, Animation.
The cardiac conduction system consists of the following components The sinoatrial node, or SA node, located in the right atrium near the entrance of the superior vena cava. This is the natural pacemaker of the heart. It initiates all heartbeat and determines heart rate. Electrical impulses from the SA node spread throughout both atria and stimulate them to contract. The atrioventricular node, or AV node, located on the other side of the right atrium, near the AV valve. The AV node serves as electrical gateway to the ventricles. It delays the passage of electrical impulses to the ventricles.
This delay is to ensure that the atria have ejected all the blood into the ventricles before the ventricles contract. The AV node receives signals from the SA node and passes them onto the atrioventricular bundle AV bundle or bundle of His. This bundle is then divided into right and left bundle branches which conduct the impulses toward the apex of the heart. The signals are then passed onto Purkinje fibers, turning upward and spreading throughout the ventricular myocardium. Electrical activities of the heart can be recorded in the form of electrocardiogram,.
ECG or EKG. An ECG is a composite recording of all the action potentials produced by the nodes and the cells of the myocardium. Each wave or segment of the ECG corresponds to a certain event of the cardiac electrical cycle. When the atria are full of blood, the SA node fires, electrical signals spread throughout the atria and cause them to depolarize. This is represented by the P wave on the ECG. Atrial contraction , or atrial systole starts about 100 ms after the P wave begins. The PQ segment represents the time the signals travel from the SA node to the AV node.
The QRS complex marks the firing of the AV node and represents ventricular depolarization Q wave corresponds to depolarization of the interventricular septum. R wave is produced by depolarization of the main mass of the ventricles. S wave represents the last phase of ventricular depolarization at the base of the heart. Atrial repolarization also occurs during this time but the signal is obscured by the large QRS complex. The ST segment reflects the plateau in the myocardial action potential. This is when the ventricles contract and pump blood.
SelfTest for Thyroid Problems
Hi I'm Dr. Allen Peters, Physician Healthy Aging Expert from NourishingWellness and I'm here today for About to share with you how to do a SelfTest for Thyroid Problems. This is a very simple exam which I do on every patient that I see, and you can do on yourself. You put your head back and feel for the thyroid cartilage. You feel both sides of the cartilage, and you might feel a small amount of soft tissue. You can exaggerate the tissue or exaggerate the thyroid cartilage by swallowing several times. If you feel more than a small amount.
Of tissueIf you feel a swelling or lumps or bumps this may be indicative on an enlarged thyroid or thyroid nodules which could be benign or malignant. If you do feel something large you should see your doctor. If he or she agrees the next step is usually getting an ultrasound. Now I want to mention that there are also some lumps behind the cartilage on the side of the neck, and these are just lymph nodes. I'm talking about the actual thyroid cartilage itself and the gland that is right there in.
That particular area. By the way, I want to emphasize that you could have an abnormal thyroid without being able to feel anything. It can be either hypothyroid or hyperthyroid. So if you are having symptoms of an increased metabolic rate like high blood pressure and palpitations and anxiety and nervousness to a great degree. Or if you are having slow down symptoms of slowdown metabolism like being tired and fatigued and depressed and low blood pressure and low pulse rate and constipated and hair falling out, then you may have thyroid disease even if you can't feel anything abnormal. So under those conditions.
10 SECRET VAGINA FACTS
What bleeds every month without dying, produces pleasure, and can push out entire human beings It's the one, the only, vagina. Oh hi babes, here are ten little known facts about the almighty vagina. The vagina is like a sock. You can put feet in it! I'm just kidding, don't put feet in it, unless. Anyway, the vagina is a pathway of muscles that's flat when there's nothing in it. Also like a sock, there's a top that stops things from getting lost. Here's my PlayDoh vagina. At the top of the vagina is the cervix.
Which looks like a little doughnut and has a tiny little hole called the os. Not a whole lot can get through that hole. Sperm can get in, blood can get out, or your period. The hole can get big to let fetuses out but other than that, it's pretty solid. Vagina is Latin for sheath or sword holder. Can you guess what sword it's referring to Just like the penis, vaginas get erections too! When you're aroused, blood rushes down to all your happy bits and your genitals and the cervix and the uterus actually.
Lift up a little bit, usually a couple inches. This causes the vagina to lengthen and your vagina can expand up to 200 percent when you're turned on. The power of the horny, people. You may have heard that the hymen needs to be broken but that's not true. The hymen, or vaginal corona is a thin membrane that's leftover from when the vagina is being formed before you're born. That membrane sits near the opening of the vagina and it doesn't pop, break, tear, and it should not bleed. They're also really fun because they come.
In all kinds of shapes and configurations! Vaginas share properties with sharks. When you're turned on, tiny glands produce a few drops of natural lubrication. That lubrication contains a substance called squalene which is also found in shark livers. That's right, if you want, it can be shark week every week. The gspot is actually the internal clitoris. The gspot sits about two inches inside the vagina on the wall closest to your belly button, like this. You're basically hitting the little legs of the clitoris. There's also some sensitive tissue around the urethra,.
Your peehole, which is right above it. That's why gspot stimulation might feel really nice, but also like ehh, am I gonna pee on you right now Vagina dentata, or vagina with teeth, aren't far from reality. Castration fears come to life in all kinds of ancient folklore about vaginas that have teeth. Now there haven't been any documented cases of vaginas that have teeth. However, there have been documented cases of teeth in ovaries and teeth in uteruses, uteri. These are called cystic teratomas and they're basically the result of stem cells.
Winding up in places that they should not be. Only 25 percent of women orgasm with their vagina. The average understanding of sex is that penis in vagina equals orgasm, but that's not nearly the full story. Only about 25 percent of women reliably experience orgasm with vaginal penetration. The clitoris, the outside of it, is much more likely to get you to the happy place. About one in 5,000 female babies is born without a vagina. It's called vaginal agenesis and it happens when the vagina fails to fully form in utero.
Most of the time this isn't discovered until the person's in their teens but luckily there's treatment for it if they want. Feeling more confident about your vagina can help to improve orgasm. As women get older they report having more satisfying sex. One of the key reasons for this is that the women have more experience and they're more confident with their vajayjay. So don't be shy, vaginas are one of the most powerful parts of the human body. Here's your daily reminder to give it the love and credit that it deserves.
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