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musclechapt.bren
Muscle
| Question | Answer |
|---|---|
| elasticity | muscles ability to recoil back to its original length after being stretched |
| contractility | shortens w force |
| fascia | connective tissue located outside the epimysium |
| each fiber is surrounded by a connective tissue sheath called the | endomysium |
| nerve cells that carry action potentials to skeletal muscle fibers | motor neurons |
| extends from Z line to Z line | sarcomere |
| each z line is an attachment for | actin |
| thin myofilaments | actin myofilaments |
| thick myofilaments | myosin myofilaments |
| myofibrils consist of how many kinds of protein fibers ? | 2 |
| where the muscle remains contracted without relaxing | tetany |
| most stationary end of the muscle | origin |
| the end of the muscle undergoing the greatest movement | insertion |
| aerobic respiration | with oxygen |
| anaerobic respiration | without oxygen |
| portion of the muscle between the origin and the insertion | belly |
| slow-twitch fibers | contract more slowly and are more resistant to fatigue |
| fast-twitch fibers | contract and fatigue quickly |
| constant tension produced by the muscles of the body | muscle tone |
| when a muscle remains contracted without relaxing | tetany |
| connective tissue located outside the epimysium | fascia |
| outside | endo |
| contraction of an entire muscle in response to a stimulus | muscle twitch |
| muscle fiber does not react to a stimulus until that stimulus reaches a level called | threshold |
| the time between application of a stimulus to a motor neuron and the beginning of a contraction is a | lag phase |
| increase in number of motor units being activated is called | recruitment |
| Needed for energy for muscle contraction | ATP |
| produced in mitochondria | ATP |
| when ATP is used during muscle contraction faster than it can be produced in the muscle cells | muscle fatigue |
| contracts more slowly and is more resistant to fatigue | slow-twitch |
| contracts more quickly and is less resistant to fatigue | fast-twitch |
| muscles that work together to accomplish specific movements | synergists |
| muscles that work in opposition with each other | antagonists |
| mastication | chewing |
| neck muscle | sternocleidomastoid |
| muscle fiber contracts maximally | all-or-none response |
| length of muscle does not change, tension increases | isometric |
| tension stays constant but length changes | isotonic |
| I bands | actin |
| A bands | myosin |
| mastication muscles have _ pairs | 4 |
| _ pairs of pterygoids | 2 |
| change shape of tongue | intrinsic tongue muscles |
| move tongue | extrinsic tongue muscles |
| muscles that move the thorax | thoracic muscles |
| tendinous area of abdominal wall | linea alba |
| group of muscles on each side of the back | erector spinae |
| accomplishes quiet breathing | diaphram |
| elevates ribs during aspiration | external intercostals |
| contract during forced aspiration | internal intercostals |
| sheetlike muscle that covers anterolateral neck | platysma |
| on each side of linea alba is the | rectus abdominis |
| there are __ muscles within the foot | 20 |
| flexes the thigh | sartorius |
| largest muscle in the body | glutious maximus |
| smile muscle | Zygomaticus |
| puckers the lips. | Orbicularis oris |
| flattens the cheeks. Trumpeter’s muscle. | buccinator |
| closes the eyelids and causes “crows feet” wrinkles in the skin at the lateral corners of the eye. | Orbicularis oculi |
| sneering | Levator labii superioris |
| frowning | Depressor anguli oris |
| raises the eyebrows | Occipitofrontalis |
| Orbicularis oris and buccinator are | the kissing muscles. |
| – form the calf muscle | Gastrocnemius and soleus |
| extends the forearm. Occupies the posterior compartment of the arm. | Triceps brachii |
| flexes the forearm. Occupies the anterior compartment of the arm. | Biceps brachii |
| flexes forearm | Brachialis |
| flexes and supinates the forearm | Brachioradialis |
| flexes the wrist. | Flexor carpi |
| extends the wrist | Extensor carpi |
| flexes the fingers | Flexor digitorum |
| extends the fingers | Extensor digitorum |
| extends the leg; anterior thigh muscles | Quadriceps femoris |
| posterior thigh muscles; flexes the leg and extends the thigh. | Hamstring |
| rotates scapula | Trapezius |
| - pulls scapula anteriorly | Serratus anterior |
Created by:
beadkin1
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