Online courses directory (27)

Most people have had the flu virus at least once in their lives, and it

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.

Find out more about heart muscles and what happens when they contract. Three Types of Muscle. Heart Cells Up Close!. Myosin and Actin. Tropomyosin and troponin and their role in regulating muscle contraction. Calcium Puts Myosin to Work. Sympathetic Nerves Affect Myosin Activity. Why Doesn't the Heart Rip?. Three Types of Muscle. Heart Cells Up Close!. Myosin and Actin. Tropomyosin and troponin and their role in regulating muscle contraction. Calcium Puts Myosin to Work. Sympathetic Nerves Affect Myosin Activity. Why Doesn't the Heart Rip?.

Check out the flow of positive charge through the heart that happens every time your heart beats! Learn how the heart is able to keep a regular rate and rhythm throughout your life. Membrane Potentials - Part 1. Membrane Potentials - Part 2. Permeability and Membrane Potentials. Action Potentials in Pacemaker Cells. Action Potentials in Cardiac Myocytes. Reseting Cardiac Concentration Gradients. Electrical System of the Heart. Depolarization Waves Flowing through the Heart. A Race to Keep Pace!. Thinking about Heartbeats. New Perspective on the Heart.

Learn about blood pressure and how we measure it. Take a deeper dive and find out how blood pressure is related to resistance and flow!. 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. 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.

Learn all about hypertension: symptoms, diagnosis, and how lifestyle changes can make a difference!. What is hypertension?. Hypertension symptoms and categories. Hypertension effects on the blood vessels. Hypertension effects on the heart. 4 lifestyle changes to help manage hypertension. What is hypertension?. Hypertension symptoms and categories. Hypertension effects on the blood vessels. Hypertension effects on the heart. 4 lifestyle changes to help manage hypertension.

Learn about how arteries differ from veins and how arteries can get damaged over time. Arteries vs. Veins - What's the difference?. Arteriosclerosis, Arteriolosclerosis, and Atherosclerosis. Atherosclerosis - Part 1. Atherosclerosis - Part 2. Arteriolosclerosis - Part 1. Arteriolosclerosis - Part 2. Arteries vs. Veins - What's the difference?. Arteriosclerosis, Arteriolosclerosis, and Atherosclerosis. Atherosclerosis - Part 1. Atherosclerosis - Part 2. Arteriolosclerosis - Part 1. Arteriolosclerosis - Part 2.

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.

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?.

Find out how the body works to maintain a normal blood pressure by sensing when its too high or too low and responding accordingly. 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. 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.

Learn some of the fundamentals behind staying healthy: Reducing your salt, keeping your weight in a healthy range, and exercising regularly. Low salt diet. Spotting salty foods. Calculate your own Body Mass Index. Introduction to exercise. 11 major muscle groups. Low salt diet. Spotting salty foods. Calculate your own Body Mass Index. Introduction to exercise. 11 major muscle groups.

Ever wonder about your lab values and what they mean? Lab values measure amounts of electrolytes or cells in your blood and occasionally tell you about how hormones and enzymes are working! Dive deeper and get a good understanding of concentrations as well!. Introduction to lab values and normal ranges. What's Inside of Blood?. Units for common medical lab values. What is an equivalent?. The mole and avogadro's number. Molarity vs. Molality. Molarity vs. Osmolarity. Calculate your own osmolarity. Molarity, Molality, Osmolarity, Osmolality, and Tonicity - What's the difference?. Tonicity - comparing 2 solutions. Introduction to lab values and normal ranges. What's Inside of Blood?. Units for common medical lab values. What is an equivalent?. The mole and avogadro's number. Molarity vs. Molality. Molarity vs. Osmolarity. Calculate your own osmolarity. Molarity, Molality, Osmolarity, Osmolality, and Tonicity - What's the difference?. Tonicity - comparing 2 solutions.

Find out what can cause a heart disease and stroke, and how the two are related!. Heart Disease and Heart Attacks. Thrombo-emboli and Thromboembolisms. Stenosis, ischemia and heart failure. Strokes. Heart Disease and Heart Attacks. Thrombo-emboli and Thromboembolisms. Stenosis, ischemia and heart failure. Strokes.

Find out why having "stiff arteries" can increase blood pressure and cause uneven blood flow. It all comes back to the idea of "total energy"!. Compliance and Elastance. Bernoulli's equation of total energy. Stored elastic energy in large and middle sized arteries. Compliance - Decreased blood pressure. Compliance - Increased blood flow. Compliance and Elastance. Bernoulli's equation of total energy. Stored elastic energy in large and middle sized arteries. Compliance - Decreased blood pressure. Compliance - Increased blood flow.

Learn about hormones and diabetes, as well as some important information on glucose control. Intro to the Endocrine System. Precocious Puberty. Childhood Growth. Glucose Insulin and Diabetes. Blood Sugar Levels. Glucose Concentration Conversion. A1C Levels. Intro to the Endocrine System. Precocious Puberty. Childhood Growth. Glucose Insulin and Diabetes. Blood Sugar Levels. Glucose Concentration Conversion. A1C Levels.

Get a ring-side seat as a pathologist talks about colon cells under the microscope. Normal Colon Tissue. Hyperplasia in Colon Tissue. Colon Dysplasia. Cancerous Colon Tissue. Normal Colon Tissue. Hyperplasia in Colon Tissue. Colon Dysplasia. Cancerous Colon Tissue.

Learn about the cervical (neck) spine through an Xray!. Adequacy of the Lateral Cervical Spine X-Ray. Assessing Alignment of the Lateral Cervical Spine (neck) X-Ray. Cervical Spine Protection in Airway Management (not a substitute for formal training). Adequacy of the Lateral Cervical Spine X-Ray. Assessing Alignment of the Lateral Cervical Spine (neck) X-Ray. Cervical Spine Protection in Airway Management (not a substitute for formal training).

Learn some basics about the Health Care system in the US. Blue Cross and Blue Shield. Conversation About Drug Pricing. Health Care Costs in US vs Europe. Healthcare System Overview. Paying Doctors. Medicare Overview. Blue Cross and Blue Shield. Conversation About Drug Pricing. Health Care Costs in US vs Europe. Healthcare System Overview. Paying Doctors. Medicare Overview.

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.

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.