muscular system. functions of the muscular system allows movement maintains posture stabilizes...
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Muscular System
Muscular System
Functions of the Muscular SystemAllows movementMaintains postureStabilizes jointsGives the body shapeGenerates heat
2 Categories of MusclesVoluntary MusclesInvoluntary MusclesMuscles you can controlExamples: muscles in your arms and legsMuscles you cannot controlExamples: heart, stomach, diaphragm
3 Types of Muscle: SkeletalSkeletal: muscles that move bonesStriated (striped)VoluntaryTires easilyFound in bundles
3 Types of Muscle: SmoothSmooth: muscles that control internal organsNo striationsInvoluntaryMakes up internal organs (stomach, intestines)Does not tire
3 Types of Muscle: CardiacCardiac: muscle that makes up the heartStriated (striped)InvoluntaryDoes not tire
RememberWhat are ligaments?Strong bands of tissue that connect bones to each other at a joint
TendonsStrong bands of tissue that attach a muscle to a bone
Muscular InjuriesSprain: ligaments stretched or tornStrain: muscles stretched or tornCramp: a muscle involuntarily contracted that will not relax
Fun Fact!Sartorius: longest muscle in the human body
How skeletal muscles workMuscles only contractThey pull, they dont pushSkeletal muscles work in pairsExample in the arm:When the biceps contracts, the triceps relaxesWhen the triceps contracts, the biceps relaxes
EnergyMuscles use energy to moveWhen muscles run out of energy = muscle fatigueWhen true fatigue hits, a muscle cannot be contracted even when stimulatedhttps://youtu.be/LKhkvSRQZYo
2 Types of ExerciseAerobic Exercise (air exercise)Jogging, biking, swimmingMakes muscles stronger, more flexible, and more resistant to fatigueIncreases metabolismEnlarges heartLungs become more efficientDOES NOT increase muscle mass much
2 Types of ExerciseAnaerobic Exercise (no air exercise)WeightliftingIncreases muscle massDoes not increase endurance
Muscle BasicsMyofibril: a muscle cellSarcomere: a tiny contractile unit of a muscleA myofibril is made of many, many sarcomeres
Muscle BasicsOne sarcomere is made of interlocking actin and myosin