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zaina assi
chapter 6 muscles
| Question | Answer |
|---|---|
| muscle cells | muscle fibers |
| muscle responsible for smiling | zygomaticus |
| contractility | the ability of skeletal muscle to shorten with force |
| fascia? | located outside the epimysium. it surrounds and separates the muscle. |
| excitability | the capacity of skeletal muscle to respond to a stimulus. |
| extensibility | the ability to be stretched |
| elasticity | ability to recoil to their original resting length after they have been stretched |
| perimysium | loose connective tissue that surrounds the fascicle. |
| endomysium | the fiber surrounded by the connective tissue. |
| myofibrils | a threadlike structure that extends from one end of the fiber to the other. |
| actin myofilaments | thin myofilaments that resemble 2 minute strands of pearls twisted together. |
| myosin myofilaments | thick myofilaments that resemble bundles of minute golf club. |
| sarcomeres | actin and myosin myofilaments that form highly ordered units. |
| resting membrane potential | the charge difference across the membrane. |
| action potential | the brief reversal back of the charge. |
| motor neurons | nerve cells that carry action potentials to skeletal muscle fibers. |
| motor unit | a single motor neuron and all the skeletal muscle fibers innervates. |
| the space between the presynaptic terminal and the muscle cell is the? | synaptic cleft |
| each presynaptic terminal contains? | synaptic vesicles |
| what happens when the sarcomeres shorten? | it causes the muscle to shorten. |
| muscle twitch | is a contraction of an entire muscle in response to a stimulus that causes the action potential i one or more muscle fibers. |
| when a muscle fiber does not respond to stimulus that stimulus reaches a level called? | threshold |
| all-or-none response | the point where the muscle fiber will contract maximally. |
| lag phase | the time between application of a stimulus to a motor neuron and the beginning of a contraction. |
| a high energy molecule that can be quickly used to produce ATP | creatine phosphate |
| cardiac muscle | is under involuntary control |
| buttocks | gluteus maximus |
| the eyebrow muscle is the | orbicularis oculi |
| anterior high muscle that extends the leg is the | quadriceps femoris |
| muscle twitch | is a contraction of an entire muscle in response to a stimulus |
| the time of contraction is the | contraction phase |
| the muscles that relaxes is the | relaxation phase |
| tetany | the condition where a muscle remains contraction without relaxing |
| aerobic resperation | occurs in the presence of oxygen |
| anerobic repiration | occurs in the absence of oxygen |
| two types of muscle contractions | isotonic and isometric |
| the most stationary end of a muscle | head |
| two types of tongue muscles | intrinsic and extrinsic |
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zaina17
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