SUPA Bio 123
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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| Tetanus | a state where muscle fibers are continually stimulated, creating sustained muscle contraction
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| Skeletal muscle | muscles attached to bones that aid in locomotion
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| Smooth muscle | muscle that lines organs such as the stomach and intestines
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| Cardiac muscle | specialized striated muscle that can create its own rhythmic depolarization without nervous system input
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| Myofibrils | a bundle of skeletal muscle, consisting of thick and thin filaments
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| Thin filaments | strands of fibers made of actin protein
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| Thick filaments | strands of fibers made of myosin protein
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| Sarcomere | the basic contractile unit of skeletal muscle. Contains sliding filaments of actin and myosin, which give skeletal muscle its striated appearance
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| Ca+2 | ion that plays an important role is skeletal muscle contraction
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| Increased Ca+2 levels | exposes myosin binding sites of the sarcromere, allowing filaments to slide and the muscle to contract.
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| Decreasing Ca+2 levels | cover the myosin binding sites of the sarcomere, stopping muscle contraction
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| Motor unit | single motor neuron + the muscle fibers it innervates (controls)
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| Cranium | main bone in the skull
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| Scapula | shoulder blade
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| Clavicle | ventral bone, connecting the sternum to the shoulder joint. It’s thin and the most easily broken bone in the body
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| Humerus | upper arm bone
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| Ulna | lower arm bone. When shaking hands it’s on the bottom
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| Radius | lower arm bone. When shaking hands it’s on the top
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| Carpals | wrist bones
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| Metacarpals | hand bones (not including fingers)
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| Phalanges | finger and toe bones
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| Femur | strongest bone in the body, located in the upper leg
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| Patella | knee cap
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| Tibia | shin bone, in lower leg
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| Fibula | smaller bone in lower leg
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| Tarsals | ankle bones
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| Metatarsals | foot bones (not including toes)
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| Ball an Socket Joint | type of joint in shoulder and hip
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| Hinge Joint | type of joint in elbow between the humerus and ulna. Only moves one way
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| Pivot Joint | joint between the radius and ulna, and also in between the skull and top vertebrae. It allows turning
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etucci
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