Khan Academy: The Effects of Microgravity on Muscle Tissues

This is a five-question quiz related to the passage "The Effects of Ultrasound on Different Tissue Types."

Video tutorial explains the photoelectric effect using wave-particle duality, the work function of a metal, and how to calculate the velocity of a photoelectron. [10:23]

Article explains the experiments on the photoelectric effect and how these experiments led to the idea of light behaving as a particle of energy called a photon.

The revolutions of chronometry, the study of time, with respect to measuring time on Earth from forms of writing to radioactivity. [9:54]

This study resource from Khan Academy provides practice questions for the MCAT. "Cellular effects of metformin, a drug for diabetes mellitus" questions are provided on this resource. Cellular Effects of Metformin, a drug for Diabetes...

The Khan Academy resource is a video about the effects of mutations.

Find out what makes smooth muscle, cardiac muscle, and skeletal muscle similar and different from one another. Rishi is a pediatric infectious disease physician and works at Khan Academy.

Read a passage about the doppler effect in living tissue and answer the follow-up questions.

This video describes how calcium ion concentration dictates whether a muscle contracts or not. [9:22]

This is a five-question quiz related to the passage "The Effect of Contrast Agents on MRI Signals."