Being the strongest muscle in the body, the hearts purpose is to pump blood through our blood vessels through rhythmic contractions. To regulate blood pressure and volume, the heart secrets "ANF", which is a very powerful peptide hormone. It affects the regulatory region of the brain, as well as the kidneys, blood vessels, and the adrenal glands.
First off, i would like to clear up a worldwide rumor; the Heart is not located on the left side of your body! Its actual location is found in the center of your chest, just SLIGHTLY of to the left hand side, and underneath the sternum. For protection, the heart is enveloped in a sac called the pericardium, and is surrounded by the lungs. First thought is, "why does the strongest muscle in the body need so much protection?". It's fragile! Weighing in at about 300 grams, the heart consists of 4 chambers; 2 lower ventricles and 2 upper atria. Valves between the atrium and the ventricle control proper blood flow from one to the other.
The job of pumping blood everywhere in the body is a huge responsibilty. Each and every beat of the heart consists of a sequence of events called the cardiac cycle. "Cardiac" is greek, meaning "heart". There is 3 major steps in the sequence: atrial systole, ventricular systole and complete cardiac diastole. After the blood has completely left the atria, the atrioventricular valves (located between atria and ventricular chambers), close to prevent backflow. This function is what you would recognize as your heartbeat. Next, there is a contraction of the ventricles and flow of blood into the circulatory system. This is known as the ventricular systole. Once again, valves called "pulmonary" and "aortic semilunar" close to prevent backflow. After these 2 steps, the heart takes a quick break called complete cardiac diastole. This allows the refilling of blood and to start the process over.
Unveiling the Risks: A Cautionary Tale from Mexico's Resorts
Mexico is often celebrated as a vibrant holiday destination, known for its stunning beaches, lively culture, and the warmth of its people. It's a place where tourists flock to unwind, engage in local commerce, sip on tequila, and bask in the sun's embrace. Many perceive it as a safe haven, especially within the confines of luxury all-inclusive resorts. However, the harrowing experience of Pamela Woods, a visitor from Canada, serves as a stark reminder that danger can lurk even in the most idyllic settings.
Discover the Wonders of Greece: A Timeless Journey
Greece, a nation where history whispers from ancient ruins and the Mediterranean sunsets paint the horizon, is a destination that promises an unforgettable journey. With a staggering 15,000 kilometers of coastline and an archipelago of enchanting islands like Rhodes, Crete, and Kos, Greece offers a diverse tapestry of experiences. Despite its inviting beaches, the country's terrain is predominantly hilly and mountainous, comprising about 80% of its landmass. These landscapes are not only a hiker's paradise but also a treasure trove of historical marvels waiting to be explored.
Find an Optometrist
I'm sure I can sign all of you up for some healthy eyes, and I am sure that none of you will mind. Your eyes are one thing that you dont want to be messing around with. Where would you be without them? Well, you wouldnt know. So to put your name down for good eyes, you first need to find an Optometrist. These people aren't too hard to locate, as there are eye clinics all over the globe.
