Atrioventricular node

Once the P wave initiates the signal, the R wave is the first upward deflection after that. Anyone can easily recognize it on the electrocardiogram (ECG). That is because it is the largest one out of all the waveforms. The R wave corresponds to the depolarization of the left and right ventricles. It does not need the Q wave to be the first deflection at all. Also, note that there can be multiple R waves. Throughout the paper, it will discuss all the wave functions, specifically the R wave, any abnormalities and how every waveform and parts of the body rely on one another to work properly. There are five waveforms: P wave, Q wave, R wave, S wave and T wave. The P wave is the SA node and it is the main starter of the electrical conduction of the heart. This wave is the first thing that is seen on the ECG sheet and shows the atrial depolarization. The Q wave is the downward deflection following the P wave and sometimes it can be seen other times it cannot.…

simultaneously contract, we travel through the tricuspid valve which along with the bicuspid or mitral valve makes up the atrioventricular valve (AV valves). The function of the tricuspid valve is to prevent the backflow of blood from reaching back into the right atrium, think of it as trap door. Where it allows blood to travel in one way but not the other, this ensure for unidirectional flow of blood at the heart. It is attached to these long strings known as chordae tendineae, made up of…

As previously stated the overall purpose of this lab was to observe the electrical events in an ECG and compare them to the mechanical events in the cardiac cycle. An electrocardiogram is, a device the records the electrical activity of the heart. The cardiac cycle consists of s major role when referring to the ECG. The heart is composed of specialized conductor cells that consist of the sinoatrial (SA) node (pacemaker calls), atrioventricular node, the bundle of his, and the Purkinje fibers.…

diastole, the atria will be going through its systole phase, so it contracts and blood flows to the ventricle by opening it atrioventricular valve. Pressure at the atria when it goes through the systole phase, is high but the ventricle is relaxing, which means it has low pressure because of pressure differentials. This results from muscle activity that actuates the opening and closing of valves, which helps the ventricle and atria to take in and out blood. “As ventricular diastole begins,…

When I was in third grade my grandfather was diagnosed with stage four carcinoid cancer. Stage four essentially means that it has reached the body 's lymph nodes and thus it can infect nearly any part of the body. While this diagnosis was bad, it never hit me how bad it was until sophomore year when he appeared to have suffered from a stroke. We got lucky however and it was Bell 's Palsy, and while that was definitely better than a stroke it was still worrisome, this was the first time I…

common type of breast cancer and it is the most diagnosed type of breast cancer [Invasive Ductal Carcinoma (IDC)1]. Invasive means that the cancer has “invaded” or spread to the surrounding breast tissues [IDC — Invasive Ductal Carcinoma 1]. Ductal means that the cancer began in the milk ducts, which are the “pipes” that carry milk from the milk-producing lobules to the nipple [IDC — Invasive Ductal Carcinoma 2]. IDC has the potential to invade your lymph and blood systems which causes spreading…

My day started off with meeting the two individuals I would be spending most of my day with which was Kat and Will who were both paramedics. Kat took me to the ambulance and showed me the things we would need in each case that we would go to and no matter what the case was the two things they would need is the medicine bag and the stretcher. Then we went through the ambulance and she showed me where most of the equipment was and the medications. As she was showing them to me she was checking…

Breast Cancer is thought to be a single disease, but actually it is a number of diseases that affect the cells, our bodies basic units of life. Humans bodies are made of many cells, grouped into 200 different types that combine to form the tissues of our body, such as skin, muscle, bone, and our breast needs them as well (The Mayo Clinic,18). This process happens because of the specific genetic programs and instructions of a cell. As the cell grows it will take its appointed place among the…

The lymph system is a tubular structure branching out to all the parts of the body and is vital to fight infections. Lymph is a colorless fluid that contains white blood cells (lymphocytes) and is carried by the lymph system. There are various types of lymphoma cancers and hence, answering a question, how to diagnose and treat lymphoma is a great challenge. The most common type of lymphoma and the term that is used interchangeably is Hodgkins disease and the rest of the types are known as…

This means their heart has a greater stroke volume, pumping out a larger volume of blood per second. Because of this, they can get more oxygen in each breath, resulting in a lower heart rate. With a stronger heart, it also performs more efficiently and does not have to beat as often in order to pump out the same amount of blood as the heart of an average person. Explain why ventricular contraction (systole) and the “lub” sound occur immediately after the QRS complex. The “lub” sound, or the…