Muscle Test
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What makes muscles unique? | Cells group together in embryo to form multinucleated tissue
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| What are muscles made of? | Fibers grouped together
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| What attaches the muscle to the bone? | Tendons
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| What is the sarcoplasmic reticulum? | A system around the fibers that releases Ca2+ when stimulated by a nerve impulse
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| What does the Ca2+ do to the muscle? | Changes the shape of the actin, allowing the myosin to bind to it.
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| How does the muscle contract? | Myosin binds to actin and pulls it toward the center of the section.
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| What is the case around the muscle fiber called? | Sarcolema
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| What is an individual fiber within a muscle fiber called? | Myofibril
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| What is the point where the muscle fiber's attach to the bone called? | Insertion point
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| What is the point where the tendon attaches the muscle to the bone? | Origin Point
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| What is the muscle that decreases the bending angle called? | Flexor
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| What is the muscle that increases the bending angle called? | Extensor
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| What causes muscle contractions? | Nerve signals cause a twitch
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| What causes a full muscle contraction? | Multiple signals
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| What is tetanus? | C. Tetani bacteria: Permanent muscle contraction
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| What does Ca2+ do to muscles? | Causes muscle contraction
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| What does K+ do to muscles? | Clears the system, relaxes muscles
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| What are slight, constant muscle contractions called? | Muscle tone
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| What is muscular dystrophy? | A genetic disorder that progressively weakens muscles
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| What is the most common type of muscle dystrophy? | Duchenne MS, found on X chromosome, wheelchaired by teens, usually death in twenties
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| What is aerobic exercise? | Exercise that increases the number of mitochondria and blood vessels in tissue, higher endurance
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| What is strength training? | Exercise that thickens muscle fibers, higher amounts of enzymes for glycolysis
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| What are steroids? | "Andro" steroids. Simulates hormone testosterone causing protein synthesis to rise. Also simulates hormone estrogen, can cause opposite gender side effects.
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