Khan Academy
Role of the Sarcoplasmic Reticulum in Muscle Cells, NCLEX-RN
Many of the concepts mentioned as an aside in previous videos are reintroduced here. By listening to Salman's recap of an action potential, students will understand how a nerve impulse can stimulate the release of neurotransmitters which...
Curated OER
Skeletal Muscle Structure
Skeletal or striated, muscles are shown down to the chemical components. All the fibers that make up a muscle cell are described and animated. Use this to illustrate the parts of skeletal muscles for your anatomy or biology classes.
Curated OER
Muscular System Structure and Function
A slide show on the muscular system is narrated, discussing the types of muscles and their functions. The muscle is shown in all its parts; the narrator briefly touches on filaments and contraction.
Khan Academy
Khan Academy: Biology: Myosin and Actin
The process of how two proteins can interact with one another to produce mechanical motion. [9:38]
Khan Academy
Khan Academy: Preload and Afterload: Frank Starling Mechanism
Carefully follow five different preload scenarios to see how each one will have a different effect on how actin and myosin line up. Rishi is a pediatric infectious disease physician and works at Khan Academy. [14:18]
Khan Academy
Khan Academy: Preload and Afterload: Preload Stretches Out the Heart Cells
Find out why stretching a heart cell in diastole affects how forcefully it contracts in systole. Rishi is a pediatric infectious disease physician and works at Khan Academy. [12:41]
Khan Academy
Khan Academy: Heart Muscle Contraction: Calcium Puts Myosin to Work
See exactly how calcium binds troponin-C and allows myosin to do some work. Rishi is a pediatric infectious disease physician and works at Khan Academy. [10:03]
PBS
Pbs Learning Media: Crash Course Anatomy and Physiology: Muscles, Part 1: Muscle Cells
We're kicking off our exploration of muscles with a look at the complex and important relationship between actin and myosin. Your smooth, cardiac, and skeletal muscles create movement by contracting and releasing in a process called the...
Sophia Learning
Sophia: Nervous System and Contractions: Lesson 1
This lesson will investigate the role of the nervous system in muscle contractions. It is 1 of 4 in the series titled "Nervous System and Contractions."
Sophia Learning
Sophia: Muscle Contractions: Micro Level: Lesson 1
This lesson will go into more detail describing how a muscle contracts. It is 1 of 4 in the series titled "Muscle Contractions: Micro Level."
Crash Course
Crash Course A&p #21: Muscles, Part 1 Muscle Cells
We're kicking off our exploration of muscles with a look at the complex and important relationship between actin and myosin. Your smooth, cardiac, and skeletal muscles create movement by contracting and releasing in a process called the...
Khan Academy
Khan Academy: Preload and Afterload: Increasing the Heart's Force of Contraction
Find out exactly how stretch increases force of contraction in end-diastole, whereas more calcium increased force of contraction in end-systole in this video lecture. [14:29]
Khan Academy
Khan Academy: Preload and Afterload: Active Contraction vs. Passive Recoil
Go through the similarities and differences between the sarcomere and a slingshot! This video explores a contraction in terms of what happens to the interaction between actin and myosin and the length of the sarcomere. Then the video...
Khan Academy
Khan Academy: What Is Contractility?
A video [13:44] that explains what contractility is and how it works to send messages through the sympathetic nervous system.
Khan Academy
Khan Academy: Calcium Puts Myosin to Work
This video shows exactly how Calcium binds Troponin-C and allows Myosin to do some work. [10:02]
Khan Academy
Khan Academy: How Tropomyosin and Troponin Regulate Muscle Contraction
This video describes how calcium ion concentration dictates whether a muscle contracts or not. [9:22]