Online courses directory (27)

Enjoy!. Bacterial Meningitis. Ritual of the Bedside Exam. Systemic Thinking About Cancer. Inflammation. Bacterial Meningitis. Ritual of the Bedside Exam. Systemic Thinking About Cancer. Inflammation.

Learn how the sympathetic and parasympathetic nerves regulate your heart in so many different ways!. Changing the AV Node Delay - Chronotropic Effect. Changing the Heart Rate - Chronotropic Effect. Increasing Ventricular Contractility - Inotropic effect. Autonomic Nervous System Effects on the Heart. Getting a New Heart. Changing the AV Node Delay - Chronotropic Effect. Changing the Heart Rate - Chronotropic Effect. Increasing Ventricular Contractility - Inotropic effect. Autonomic Nervous System Effects on the Heart. Getting a New Heart.

Find out exactly what preload and afterload mean, and why most of us use a handy shortcut to guess-timating what they are!. Why Doesn't the Heart Rip?. What is Preload?. Preload and Pressure. Preload Stretches out the Heart Cells. Frank-Starling Mechanism. Sarcomere length-tension relationship. Active contraction vs. passive recoil. What is afterload?. Increasing the Heart's Force of Contraction. Why Doesn't the Heart Rip?. What is Preload?. Preload and Pressure. Preload Stretches out the Heart Cells. Frank-Starling Mechanism. Sarcomere length-tension relationship. Active contraction vs. passive recoil. What is afterload?. Increasing the Heart's Force of Contraction.

Watch as the pressure and amount of blood inside the left ventricle go up and down within fractions of a second!. Pressure in the Left Heart - Part 1. Pressure in the Left Heart - Part 2. Pressure in the Left Heart - Part 3. Left Ventricular Pressure vs. Time. Left Ventricular Volume vs. Time. Drawing a Pressure-Volume Loop. Understanding the Pressure-Volume Loop. End Diastolic Pressure-Volume Relationship (EDPVR). End Systolic Pressure-Volume Relationship (ESPVR). Reimagine the Pressure Volume Relationship. What is Preload?. Why Doesn't the Heart Rip?. Pressure in the Left Heart - Part 1. Pressure in the Left Heart - Part 2. Pressure in the Left Heart - Part 3. Left Ventricular Pressure vs. Time. Left Ventricular Volume vs. Time. Drawing a Pressure-Volume Loop. Understanding the Pressure-Volume Loop. End Diastolic Pressure-Volume Relationship (EDPVR). End Systolic Pressure-Volume Relationship (ESPVR). Reimagine the Pressure Volume Relationship. What is Preload?. Why Doesn't the Heart Rip?.

Your heart sits in the middle of your chest and pumps blood from about 4 weeks after conception until the day that you die. It never stops, and over your lifetime it will pump ~175 million liters of blood. To visualize that, imagine the amount of water that falls over Niagara falls in a few minutes. Remarkable! This little pump is the size of your clenched fist and in an adult can weigh about 300 grams. Watch these videos to learn more about how the heart works, blood flow in arteries and veins, and blood pressure. Meet the heart!. Layers of the Heart. Flow through the Heart. Two Circulations in the Body. Lub Dub. Heart Quiz. Circulatory System and the Heart. Arteries vs. Veins - What's the difference?. Layers of a blood vessel. Arteries, Arterioles, Venules, and Veins. Three Types of Capillaries. Pre-Capillary Sphincters. What is blood pressure?. Learn how a stethoscope can help determine blood pressure. Resistance in a tube. Adding up resistance in series and in parallel. Adding up resistance problem. Flow and Perfusion. Putting it all together: Pressure, flow, and resistance. Blood pressure changes over time. Regulation of blood pressure with baroreceptors. Parts of a nephron. General overview of the RAAS system - Cells and hormones. Renin production in the kidneys. Activating Angiotensin 2. Angiotensin 2 raises blood pressure. Aldosterone raises blood pressure and lowers potassium. Aldosterone removes acid from the blood. ADH secretion. ADH effects on blood pressure. Aldosterone and ADH. Meet the heart!. Layers of the Heart. Flow through the Heart. Two Circulations in the Body. Lub Dub. Heart Quiz. Circulatory System and the Heart. Arteries vs. Veins - What's the difference?. Layers of a blood vessel. Arteries, Arterioles, Venules, and Veins. Three Types of Capillaries. Pre-Capillary Sphincters. What is blood pressure?. Learn how a stethoscope can help determine blood pressure. Resistance in a tube. Adding up resistance in series and in parallel. Adding up resistance problem. Flow and Perfusion. Putting it all together: Pressure, flow, and resistance. Blood pressure changes over time. Regulation of blood pressure with baroreceptors. Parts of a nephron. General overview of the RAAS system - Cells and hormones. Renin production in the kidneys. Activating Angiotensin 2. Angiotensin 2 raises blood pressure. Aldosterone raises blood pressure and lowers potassium. Aldosterone removes acid from the blood. ADH secretion. ADH effects on blood pressure. Aldosterone and ADH.

Get a better understanding of how your lungs help you to sing and survive!. Meet the lungs. People and plants. The Bronchial Tree. Inhaling and Exhaling. How does Lung Volume Change?. The Lungs and Pulmonary System. Alveolar Gas Equation - Part 1. Alveolar Gas Equation - Part 2. O2 and CO2 solubility. Henry's law. Graham's Law of Diffusion. Fick's Law of Diffusion. Oxygen Movement from Alveoli to Capillaries. Peripheral Chemoreceptors. Central Chemoreceptors. The Respiratory Center. Sneeze, Cough, and Hiccup. Meet the lungs. People and plants. The Bronchial Tree. Inhaling and Exhaling. How does Lung Volume Change?. The Lungs and Pulmonary System. Alveolar Gas Equation - Part 1. Alveolar Gas Equation - Part 2. O2 and CO2 solubility. Henry's law. Graham's Law of Diffusion. Fick's Law of Diffusion. Oxygen Movement from Alveoli to Capillaries. Peripheral Chemoreceptors. Central Chemoreceptors. The Respiratory Center. Sneeze, Cough, and Hiccup.

LeBron James asks questions about math and science, and we answer!. LeBron Asks: What muscles do we use when shooting a basket?. LeBron Asks: How does shooting a basketball illustrate Newton's 3rd Law?. LeBron Asks: If Earth's history were a basketball game, when did humans appear?. LeBron Asks: Why does sweating cool you down?. LeBron Asks: Why does humidity make it feel hotter?. LeBron Asks: What are the chances of making 10 free throws in a row?. LeBron Asks: What are the chances of three free throws versus one three pointer?. Monte Carlo Simulation to Answer LeBron's Question. LeBron Asks: What muscles do we use when shooting a basket?. LeBron Asks: How does shooting a basketball illustrate Newton's 3rd Law?. LeBron Asks: If Earth's history were a basketball game, when did humans appear?. LeBron Asks: Why does sweating cool you down?. LeBron Asks: Why does humidity make it feel hotter?. LeBron Asks: What are the chances of making 10 free throws in a row?. LeBron Asks: What are the chances of three free throws versus one three pointer?. Monte Carlo Simulation to Answer LeBron's Question.