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Muscular System
| Question | Answer |
|---|---|
| raises the eyebrows | occipitofrontalis |
| closes the eyelids | orbicularis oculi |
| puckers the lips | orbicularis oris |
| flattens the cheeks | buccinator |
| smiling muscle | zygomaticus |
| sneering | levator labii superioris |
| frowning | depressor anguli oris |
| chewing | mastication |
| changes shape of tongue | intrinsic tongue muscles |
| moves the tongue | extrinsic tongue muscles |
| lateral neck muscle | sternocleidomastoid |
| group of muscles on each side of the back | erector spinae |
| muscles that move the thorax | thoracic muscles |
| tendinous area of the abdominal wall | linea alba |
| muscle on each side of the linea alba | rectus abdominous |
| crosses the rectus abdominous | tendinous inscriptions |
| rotates scapula | trapezius |
| pulls scapula anteriorly | serratus anterior |
| arm attached to the thorax by | pectoralis major, latissimus dorsi muscles |
| adducts and flexes the arm | pectoralis major |
| medially rotates, adducts, and powerfully extends the arm. "swimmer muscles" | latissimus dorsi |
| attaches humerus to scapula and clavicle | deltoid |
| extends forearm | triceps brachii |
| flexes forearm | biceps brachii |
| flexes forearm | brachialis |
| flexes and supinates the forearm | brachiordialis |
| strong band of fibrous connective tissue around wrist | retinaculum (bracelet) |
| flexes the wrist | flexor carpi |
| extends the wrist | extensor carpi |
| flexes the fingers | flexor digitorum |
| extends the fingers | extensor digitorum |
| muscles reponsible for abduction and adduction within the fingers | interossi |
| buttocks | gluteus maximus |
| hip muscle | gluteus medius |
| extends the leg | quadriceps femoris |
| flexes the thigh | sartorius |
| posterior thigh muscles | hamstring |
| calf muscles | gastrocnemius and soleus |
| flexes the foot and toes | calcaneal tendon |
| muscles in the foot | intrinsic foot muscles |
| lateral muscles of the leg | peroneus |
| muscle cells | muscle fibers |
| to shorten or develop tension | contraction |
| muscle attached to skeleton | skeletal muscle |
| thin connective tissue surrounding each muscle cell | endomysium |
| connective tissue enveloping bundles of muscle fibers | perimysium |
| sheath of fibrous connective tissue surrounding a muscle | epimysium |
| bundle of nerve or muscle fibers bound together by connective tissue | fascicle |
| muscle consisting of spindle-shaped striped muscle cells | smooth muscle |
| specialized muscle of the heart | cardiac muscle |
| oval nuclei seen beneath plasma membrane | sarcolemma |
| smallest contractile unit of muscle | sarcomere |
| one of the principal contractile proteins found in muscle | myosin |
| a contractile protein | actin |
| specialized smooth ER | sacroplasmic reticulum |
| a motor neuron and all the muscle cells it supplies | motor unit |
| neuron process that carries neurons away from the nerve cell body | axon |
| a chemical transmitter substance released by certain nerve endings | acetylcholine |
| decline in ability of muscles to generate force | muscle fatigue |
| shortening of the muscle | isotonic contraction |
| muscle contraction without movement | isometric contractions |
| attachment of a muscle that remains fixed during contraction | origin |
| the movable attachment of a muscle as opposed to its origin | insertion |
| muscles cooperating with another muscle or muscle group to produce a desired movement | synergists |
| muscles that act in opposition to an agonist or prime mover | antagonists |
| muscles acting to immobilize a joint or bone | fixators |
| the ability of skeletal muscle to shorten with force. | contractility |
| the capacity of skeletal muscle to respond to a stimulus. | excitability |
| the ability to be stretched. | extensibility |
| ability to recoil to their original resting length after they have been stretched. | elasticity |
| thin myofilaments | actin myofilaments |
| thick myofilaments | myosin myofilaments |
| nerve cells that carry action potentials to skeletal muscle fibers. | motor neurons |
| A single motor neuron and all the skeletal muscle fibers it innervates | motor unit |
| Actin and myosin myofilaments form highly ordered units | sarcomeres |
| The charge difference across the membrane | resting membrane potential |
| The brief reversal back of the charge | action potential |
Created by:
alyssaihlenfeld
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