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The Muscular System Objectives Muscles ● Describe how skeletal muscles move bones ● Compare aerobic exercise with resistance exercise ● Describe 2 muscular system injuries ● The muscular system is made up of the muscles that let you ________ ● A muscle is an _______ that can _______ and __________ to allow movement. Muscles hold you _________ and allow body movement. Kinds of Muscles Involuntary vs. Voluntary ● Smooth muscles: muscles that are found in the _______ tract and in the _______ of blood vessels ● Cardiac muscles: muscles found only in the _________ ● Skeletal muscles: muscles that move ________. ● Involuntary muscles: muscular action that is ___ under ______ control (Ex: stomach, heart) ● Voluntary muscles: muscle action that is under your _________ ● Skeletal muscles make hundreds of movements. The muscles move after a ______ __________ from your _______ to your skeletal muscle cells, which _________, then movement occurs. Tendons Working Pairs ● Tendon: tough connective tissue that ____________ your skeletal muscles to your _________ ● Your skeletal muscles have to _______ together to move your bones ● One muscle will ______ (get shorter) and _____ part of the body, while the other muscle gets ______ and _____________ part of the body Flexor vs. Extensor Types of resistance exercise ● A _______ is a smooth muscle that _____ part of your body. An ____________ is the muscle that __________ part of your body. ● Muscles that are not used will become smaller and weaker, but muscles that are exercised will get bigger. ● ___ types of exercise will increase muscle strength and endurance ● ____________ exercise: exercise where people _______ against the resistance or __________ of an object ● _________ exercise: steady, ______________ intense ____________ like jogging, cycling, skating, or swimming, which increase muscle strength Muscle Injuries Anabolic Steroids ● Strains: injuries in which a muscle or tendon is ________________ or _______ ● Tendonitis: condition where a tendon becomes ______________ ● Anabolic steroids _________________ muscles but can _____________ the heart, liver, and kidneys Steroid effects Describe several reasons why someone would choose to use steroids despite the the harm they cause.