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Blood Pressure Control : ADH secretion

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Learn the key triggers for ADH secretion. Rishi is a pediatric infectious disease physician and works at Khan Academy.

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Hypertension : Hypertension effects on the heart

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Learn 2 major heart problems that hypertension can cause. Rishi is a pediatric infectious disease physician and works at Khan Academy.

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Heart Depolarization : Action Potentials in Cardiac Myocytes

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See how muscle cells in the heart contract by allowing Calcium to flow inside and bringing along some positive charge with it! Rishi is a pediatric infectious disease physician and works at Khan Academy.

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Fetal Circulation : Foramen Ovale and Ductus Arteriosus

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Watch how the fetal heart allows blood to simply bypass the lungs altogether using the Foramen Ovale and the Ductus Arteriosus! Rishi is a pediatric infectious disease physician and works at Khan Academy.

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Blood Pressure Control : Aldosterone removes acid from the blood

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See how Aldosterone acts on the alpha-intercalated cell to remove protons (acid) from the blood. Rishi is a pediatric infectious disease physician and works at Khan Academy.

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Blood : Hemoglobin moves O2 and CO2

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Learn the two ways that oxygen moves from the lungs to the tissues, and the three ways that carbon dioxide returns from the tissues to the lungs. Rishi is a pediatric infectious disease physician and works at Khan Academy.

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Lab Values and Concentrations : Calculate your own osmolarity

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Learn how to use three lab values (Sodium, glucose, and BUN) to approximate your plasma osmolarity. Rishi is a pediatric infectious disease physician and works at Khan Academy.

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Blood Pressure Control : Parts of a nephron

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Learn about the 5 major parts of the kidney's nephron. Rishi is a pediatric infectious disease physician and works at Khan Academy.

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Changing the PV Loop : Reimagine the Pressure Volume Relationship

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Understand what is happening at the cellular level to cause two identical left ventricular volumes to have such different pressures! Rishi is a pediatric infectious disease physician and works at Khan Academy.

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Healthy Lifestyle : Spotting salty foods

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Find out how much sodium is in some common foods and how you can maintain a low sodium diet. Rishi is a pediatric infectious disease physician and works at Khan Academy.

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The Lungs : The Bronchial Tree

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Follow the path of an oxygen molecule as it makes its way from your mouth down to an alveolus! Rishi is a pediatric infectious disease physician and works at Khan Academy.

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Endocrinology and Diabetes : Glucose Concentration Conversion

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Blood Vessel Diseases : Atherosclerosis - Part 1

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See how Atherosclerosis (Fat in the blood vessel wall) hardens the arterial wall and makes it harder for blood to flow through. Rishi is a pediatric infectious disease physician and works at Khan Academy.

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Hypertension : 4 lifestyle changes to help manage hypertension

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Remember that a good diet, exercise, losing weight, and quitting smoking can lower blood pressure! Rishi is a pediatric infectious disease physician and works at Khan Academy.

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The Lungs : Inhaling and Exhaling

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Find out exactly why air goes in and out of the lungs. Rishi is a pediatric infectious disease physician and works at Khan Academy.

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Pressure Volume Loops : Left Ventricular Volume vs. Time

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Left ventricular volume changes over time in a way that makes a curious looking graph. Learn more in this video! Rishi is a pediatric infectious disease physician and works at Khan Academy.

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Changing the PV Loop : Increasing the Heart's Force of Contraction

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Find out exactly how stretch increases force of contraction in end-diastole, whereas more calcium increased force of contraction in end-systole. Rishi is a pediatric infectious disease physician and works at Khan Academy.

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Heart Depolarization : Reseting Cardiac Concentration Gradients

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Watch as the heart cells use energy to reset the concentration gradients for all of the ions after the action potential has gone through. Rishi is a pediatric infectious disease physician and works at Khan Academy.

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Pressure Volume Loops : End Diastolic Pressure-Volume Relationship...

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Find out what happens when the left ventricle is not allowed to contract, and instead you simply add and take away blood from it. Rishi is a pediatric infectious disease physician and works at Khan Academy.

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Blood : Oxygen Content

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Learn how oxygen content (CaO2) is related to Hemoglobin concentration (Hb), oxygen saturation (SaO2), and the partial pressure of oxygen (PaO2). Rishi is a pediatric infectious disease physician and works at Khan Academy.

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