Khan Academy: Understanding Spectra

Practice questions on understanding cardiac pressure-volume curves.

Practice questions understanding the ballistics of gene bombardment.

Figure out how all of those physiology terms - end-systolic, end-diastolic, pulse pressure, stroke volume, and ejection fraction - can be easily understood using the pressure-volume loop. Rishi is a pediatric infectious disease physician...

Learn how blood flows through the heart, and understand the difference between systemic and pulmonary blood flow. Rishi is a pediatric infectious disease physician and works at Khan Academy.

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.

Understand LaPlace's law to see the effect that pressure, radius, and wall thickness each have on the "wall stress" in the left ventricle to answer the question of why the heart never gets a rip or tear. Rishi is a pediatric infectious...

An understanding and explanation of R nought and the spread of diseases.

Read the passage and study the graphic to complete the five-question quiz about the properties of radioactive tracers.

Learn how to read and draw phylogenetic trees, or cladograms.

Dr. Rishi Desai, a pediatric infectious disease physician, describes the Ebola outbreak, symptoms, fatality rate, and transmission. [11:16]