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Seasonal changes can bring sneezing, a runny nose, coughing, throat irritation, and congestion. Changes in temperature, dry air, allergies, and respiratory viruses can all contribute to these symptoms. Fortunately, simple home remedies and healthy habits may help soothe discomfort and support recovery. In this article, discover 10 practical home remedies for seasonal cold, cough, and throat irritation, along with prevention tips and warning signs that should not be ignored. https://educa-trix.blogspot.com/2026/10/seasonal-cold-cough-throat-irritation-home-remedies.html Why Do Cold, Cough and Throat Irritation Increase During Seasonal Changes? Seasonal transitions can coincide with increased circulation of respiratory viruses and exposure to allergens. Common causes include: Viral infections: Common cold viruses can cause sneezing, nasal congestion, coughing, and sore throat. Allergies: Pollen, dust, and mold may trigger sneezing, an itchy throat, and a runny nose. Dry air: Dry indo...
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Human Heart Circulatory System (Part 2)
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What is the Cardiovascular System?
The cardiovascular system refers to the heart, blood vessels and the blood. Blood contains oxygen and other nutrients which your body needs to survive. The body takes these essential nutrients from the blood. At the same time, the body dumps waste products like carbon dioxide, back into the blood, so they can be removed. The main function of the cardiovascular system is therefore to maintain blood flow to all parts of the body, to allow it to survive. Veins deliver used blood from the body back to the heart. Blood in the veins is low in oxygen (as it has been taken out by the body) and high in carbon dioxide (as the body has unloaded it back into the blood). All the veins drain into the superior and inferior vena cava which then drain into the right atrium. The right atrium pumps blood into the right ventricle. Then the right ventricle pumps blood to the pulmonary trunk, through the pulmonary arteries and into the lungs. In the lungs the blood picks up oxygen that we breathe in and gets rid of carbon dioxide, which we breathe out. The blood is becomes rich in oxygen which the body can use. From the lungs, blood drains into the left atrium and is then pumped into the left ventricle. The left ventricle then pumps this oxygen-rich blood out into the aorta which then distributes it to the rest of the body through other arteries. The main arteries which branch off the aorta and take blood to specific parts of the body are:
*Carotid Arteries, which take blood to the neck and head
*Coronary arteries, which provide blood supply to the heart itself
*Hepatic artery, which takes blood to the liver with branches going to the stomach
*Mesenteric Artery, which takes blood to the intestines
*Renal Arteries, which takes blood to the kidneys
*Femoral arteries, which take blood to the legs
The body is then able to use the oxygen in the blood to carry out its normal functions. This blood will again return back to the heart through the veins and the cycle continues.
What is the Cardiac Cycle?
The Cardiac Cycle is the sequence of events that occurs in one complete beat of the Heart. The pumping phase of the cycle, also known as Systole, occurs when heart muscle contracts. The filling phase, which is known as diastole, occurs when heart muscle relaxes. At the beginning of the cardiac cycle, both atria and ventricles are in diastole. During this time, all the chambers of the heart are relaxed and receive blood. The atrioventricular valves are open. Atrial systole follows this phase. During atrial systole, the left and right atria contract at the same time and push blood into the left and right ventricles, respectively. The next phase is ventricular systole. During ventricular systole, the left and right ventricles contract at the same time and pump blood into the aorta and pulmonary trunk, respectively. In ventricular systole, the atria are relaxed and receive blood. The atrioventricular valves close immediately after ventricular systole begins to stop blood going back into the atria. However, the semilunar valves are open during this phase to allow the blood to flow into the aorta and pulmonary trunk. Following this phase, A the ventricles relax that is ventricular diastoleoccurs. The semilunar valves close to stop the blood from flowing back into the ventricles from the aorta and pulmonary trunk. The atria and ventricles once again are in diastole together and the cycle begins again.
Components of the Heartbeat
The adult heart beats around 70 to 80 times a minute at rest. When you listen to your heart with a stethoscope you can hear your heart beat. The sound is usually described as “lubb-dupp”. The “lubb” also known as the first heart sound, is caused by the closure of the atrioventricular valves. The “dupp” sound is due to the closure of the semilunar valves when the ventricles relax (at the beginning of ventricular diastole). Abnormal heart sounds are known as murmurs. Murmurs may indicate a problem with the heart valves, but many types of murmur are no cause for concern.
The Electrocardiogram
The heart has an inbuilt rhythm of contraction and relaxation. A small group of heart muscle cells called the pacemaker help achieve this. The pacemaker generates an electrical impulse which spreads over the atria, making them contract. This impulse then spreads to the ventricles, causing them to contract. The electrical changes that spread through the heart can be detected at the surface of the body by an instrument called the electrocardiograph. Electrodes are placed in a number of positions over the chest and the electrical changes are recorded on moving graph paper as an Electrocardiogram(ECG).
Effects of Aging on the Heart in Men and Women
As a part of the normal aging process a number of changes occur to the cardiovascular system.
Our heart rate slows down because the time between heartbeats increases as we age. This is one of the main reasons why the heart is unable to pump out more blood during exercise when we become old.
The amount of blood the heart pumps each minute can change as we age. It decreases slightly in older women. However, it does not change in healthy older men who have no heart disease. The reason for the difference between the sexes is not fully understood.
As we age, our blood pressure falls much more on standing from the sitting position compared to when we are younger. This phenomenon is known as postural hypotension. This explains why elderly people are more likely to feel dizzy or to fall when they stand up quickly from a resting position.
From the above given information you will get to know about Human Heart Circulation.
Introduction Cystic fibrosis (CF) is a hereditary disorder that primarily affects the lungs and digestive system. It is characterized by the production of abnormally thick and sticky mucus that can clog the airways and obstruct the pancreas. CF is a progressive disease, leading to severe respiratory and digestive problems, and it often results in a shortened lifespan. Causes Cystic fibrosis is caused by mutations in the CFTR (cystic fibrosis transmembrane conductance regulator) gene. This gene is responsible for the production of a protein that regulates the movement of salt and water in and out of cells. Mutations in the CFTR gene result in the production of a defective protein, leading to the accumulation of thick mucus in various organs. Symptoms The symptoms of cystic fibrosis can vary widely but commonly include: Respiratory symptoms: Persistent coughing, frequent lung infections (including pneumonia and bronchitis), wheezing, and shortness of breath. Digestive symptoms: Difficu...
Liver cysts are fluid-filled sacs that develop inside the liver. Most liver cysts are harmless and may not cause symptoms, but some can grow larger and lead to discomfort or complications. These cysts can form in any lobe of the liver — right lobe or left lobe — depending on the underlying cause. https://educa-trix.blogspot.com/2026/05/how-to-correct-non-alcoholic-fatty.html What Is a Liver Cyst? A liver cyst is a small pocket filled with fluid inside the liver tissue. Many people discover liver cysts accidentally during an ultrasound or CT scan done for another reason. Most simple liver cysts are non-cancerous and do not affect liver function. Common Reasons for Liver Cyst Formation 1. Congenital (Present Since Birth) Cysts Some people are born with tiny abnormalities in the bile ducts that later develop into cysts. These are called simple liver cysts . Features: Usually harmless Often found after age 40 More common in women May remain symptom-free for years 2. Pol...
https://educa-trix.blogspot.com/2026/07/thyroid-imbalance-during-menopause-causes-symptoms-prevention.html MMR Immunization: A Small Vaccine That Gives Big Protection The MMR vaccine is one of the most important childhood vaccines. It protects children from Measles, Mumps, and Rubella —three highly contagious viral infections that can cause serious complications, including pneumonia, hearing loss, brain infection, birth defects, and even death in severe cases. The World Health Organization (WHO) recommends two doses of measles-containing vaccines for strong, long-lasting protection. Giving the MMR vaccine on time helps protect not only your child but also vulnerable people in the community through improved immunity coverage. https://educa-trix.blogspot.com/2026/07/thyroid-imbalance-during-menopause-causes-symptoms-prevention.html MMR Vaccine Schedule (India) According to pediatric recommendations in India, children should receive MMR in the following schedule: immunizeindia.org Age V...
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