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Muscle
| Question | Answer |
|---|---|
| Thin myofilaments | Actin Myofilaments |
| Thick myofilaments | Myosin myofilaments |
| The ability of a muscle to shorten with force | Contractility |
| The ability to be stretched | Extensibility |
| Ability to recoil to their original resting length after being stretched | Elasticity |
| The brief reversal of a charge | Action potential |
| The charge difference across a membrane | Resting membrane potential |
| Nerve cells that carry action potentials to skeletal muscle fibers | Motor neurons |
| The enlarged nerve terminal | Presynaptic terminal |
| The time between application of a stimulus to a motor neuron and the beginning of a contraction | Lag Phase |
| The time of contraction | Contraction phase |
| The time during which a muscle relaxes. | Relaxation phase |
| Where the muscles remain contracted without relaxing | Tetany |
| The increase in number of motor units being activated. | Recruitments |
| What is produced in the mitochondria | ATP |
| The A band extends the length of | Myosin |
| Each presynaptic terminal contains. | Acetylcholine |
| The constant tension produced by muscles of the body for long periods of time. | Muscle Tone |
| Contract quickly and fatigue quickly | Fast Twitch fibers |
| Isometric | The length of the muscle does not change, but the amount of tension increases during the contraction process. |
| Isotonic | The amount of tension produced by the muscle is constant during contraction, but the length of the muscle changes. |
| Slow-twitch fibers | Contract more slowly and are more resistant to fatigue. |
| Origin | The most stationary end of the muscle. |
| Insertion | The end of the muscle undergoing the greatest movement. |
| Belly | The portion of the muscle between the origin and the insertion |
| Muscles that work together to accomplish specific movements | Synergists |
| Muscles that work in opposition to one another | Antagonists |
| If one muscle plays the major role in accomplishing the desired movement | Prime Mover |
| Skeletal muscle is surrounded by this connective tissue sheath | Epimysium |
| Connective tissue located outside the epimysium. | Fascia |
| The visible bundles within a muscle | Fascicles |
| The single muscle cells that fasciculi is composed of | Fibers |
| Each fiber is surrounded by a connective tissue sheath called | Endomysium |
| The cytoplasm of each fiber is filled with | Myofibrils |
| Actin and myosin myofilaments form highly ordered units called | Sarcomeres |
| The muscle that changes the shape of the tongue. | Intrinsic tongue muscles |
| The muscle that moves the tongue | Extrinsic Tongue muscles |
| What muscle causes chewing | Mastication |
| The muscle responsible for frowning | Depressor Anguli Oris |
| The muscle responsible for sneering | Levator labii superioris |
| The smiling muscle | Zygomaticus |
| The muscle responsible for the puckering of the lips | Orbicularis oris |
| The muscle responsible for raising the eyebrows | Occipitofrontalis |
| Sheetlike muscle that covers the anterolateral neck. | Platysma |
| Lateral neck muscle and prime mover | Sterncleidomastoid |
| The muscle that flattens the cheeks. | Buccinator |
| Accomplishes quiet breathing | Diaphram |
| Elevates the ribs during inspiration | External Intercostals |
| Contracts during forced expiration | Internal intercostals |
| Muscles that move the thorax | Thoracic muscles |
| Group of muscles on each side of the back | Erector spinae |
| The muscle one ach side of the linea alba | Rectus abdominis |
| The muscle responsible for closing the eyelids and causing "crows feet" wrinkles. | Orbicularis oculi |
| What rotates the scapula | Trapezius |
| What pulls the scapula anteriorly | Serratus Anterior |
| The arm is attached to the thorax by what | The pectoralis major and the latissimus dorsi muscles. |
| What adducts and flexes the arm | Pectoralis major |
| What medially rotates, adducts, and extends the arm. | Latissimus dorsi |
| Extends the forearm | Tricepsbrachii |
| Flexes the forearm | Biceps brachii |
| Flexes and supinates the forearm | Brachioradialis |
| The buttocks | Gluteus maximus |
| Extends the leg | Quadriceps femoris |
| Hip muscle and common injection site | Gluteus medius |
| Flexes the thigh | Sartorius |
| Forms the calf muscle | Gastrocnemius and soleus |
| Posterior thigh muscles | Hamstring |
| These muscles flex, extend, abduct, and adduct the toes. | Intrinic foot |
| The lateral muscles of the leg | The peroneus muscles |
| Strong band of connective tissue that covers the flexor and extensor tendons. | Retinaculum |
| Flexes the wrist | Flexor carpi |
| Extends the wrist | Extensor carpi |
| Flexes the fingers | Flexor digitorum |
| Extends the fingers | Extensor digitorum |
| The 19 hand muscles | Intrinic hand muscles |
| attaches the humerus to the scapula and clavicle | Deltoid |
| These cross the rectus abdominis at three or more locations | Tendinous inscriptions |
Created by:
eepenni2
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