Crash Course Biology: Your Muscular System
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The Big Guns: Your Muscular System - CrashCourse Biology #31
Hank tells us the story of the complicated chemical dance that allows our skeletal muscles to contract and relax.
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Table of Contents
1) Cardiac, Smooth, & Skeletal Muscles 01:09
2) Muscle Anatomy 02:03
a) Muscle Fibers 03:07
b) Myofibrils 04:15:1
c) Sarcomeres 04:19:1
d) Myofilaments 04:37:2
3) Biolography 05:37:1
4) Sliding Filament Model 07:47
References for this episode can be found in the Google document here: http://dft.ba/-3syE
Hank tells us the story of the complicated chemical dance that allows our skeletal muscles to contract and relax.
Like CrashCourse: http://www.facebook.com/YouTubeCrashCourse
Follow CrashCourse: http://www.twitter.com/TheCrashCourse
Table of Contents
1) Cardiac, Smooth, & Skeletal Muscles 01:09
2) Muscle Anatomy 02:03
a) Muscle Fibers 03:07
b) Myofibrils 04:15:1
c) Sarcomeres 04:19:1
d) Myofilaments 04:37:2
3) Biolography 05:37:1
4) Sliding Filament Model 07:47
References for this episode can be found in the Google document here: http://dft.ba/-3syE
Aug 28, 2012 3:00 AM
Re: CrashCourse Biology: Your Muscular System
Hank went far further than just scratching the surface on ATP. Most of this stuff I kind of forgot. But I think he was lacking in how the body creates ATP.
Some ATP is stored in the muscle for that quick fight or flight response. In the case of running, no more than 30 seconds or so of energy provided. The body’s capacity to store ATP is limited as most food energy is stored as body fat or as glycogen in the muscles and liver.
There are four systems in the human body that create ATP in different ways. There are two anaerobic systems, the Phosphagen System and the Oxygen Independent Glycolytic System, that do not require oxygen to produce ATP. These two systems are associated with short bursts of energy like sprinting or lifting heavy weights.
The two aerobic systems, the Oxygen Dependent Glycolytic System and the Oxygen Dependent Lipolytic System require oxygen to produce ATP and are associated with longer endurance bouts of energy, like marathon running.
Some ATP is stored in the muscle for that quick fight or flight response. In the case of running, no more than 30 seconds or so of energy provided. The body’s capacity to store ATP is limited as most food energy is stored as body fat or as glycogen in the muscles and liver.
There are four systems in the human body that create ATP in different ways. There are two anaerobic systems, the Phosphagen System and the Oxygen Independent Glycolytic System, that do not require oxygen to produce ATP. These two systems are associated with short bursts of energy like sprinting or lifting heavy weights.
The two aerobic systems, the Oxygen Dependent Glycolytic System and the Oxygen Dependent Lipolytic System require oxygen to produce ATP and are associated with longer endurance bouts of energy, like marathon running.
By: spam_vigilante
Re: CrashCourse Biology: Your Muscular System
He also didn't explain why muscles can't exert as much force when they're stretched out as to when they are in a more contracted state. It's because when the muscle stretches, the overlap between the actin and myosin decreases and less binding between the two can occur.
Re: CrashCourse Biology: Your Muscular System
A true statement. But also, the issue lies with leverage. Most musculoskeletal levers are considered third-class levers where mechanical advantage is actually negative. There are the other two types of levers at work in the human body so you probably have the most consistent reason to bring to light.
Damnit Hank! We need a follow up or sequel to this clip.
Damnit Hank! We need a follow up or sequel to this clip.
By: spam_vigilante
