Khan Academy
Khan Academy: Action Potentials in Cardiac Myocytes
See how muscle cells in the heart contract by allowing calcium to flow inside and bringing along some positive charge with it! [12:10]
Khan Academy
Khan Academy: Skeletal Endocrine Control
This video explains how the endocrine system plays an important role in calcium homeostasis through its effect on bone remodeling and its effect on calcium absorption. [8:22]
Sophia Learning
Sophia: Skeletal Health: Lesson 1
This lesson will describe the effects that exercise and nutrition have in the health of your skeletal system. It is 1 of 4 in the series titled "Skeletal Health."