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Easthams Muscle
Muscles
| Question | Answer |
|---|---|
| Ability to shorten with force | Contractility |
| Skeletal muscle responds to a stimulus | Excitability |
| The ability to be stretched | Extensibility |
| to recoil to their original resting length after they have been stretched | Elasticity |
| Skeletal muscle is surrounded by a connective tissue sheath called | Epimysium |
| Another connective tissue located outside of the epimysium | Fascia |
| each fiber is filled with | Myofibrils |
| Nerve cells that carry action potentials to skeletal muscle fibers | Motor neurons |
| Single motor unit and all skeletal muscle fibers it innervates | Motor Neurons |
| A contraction of an entire muscle | Muscle Twitch |
| Time between application and beginning of a contraction | Lag Phase |
| Muscle remains contracted without relaxing | Tetany |
| raises the eyebrows | Occipitofrontalis |
| closes eyelids and causes "crows feet" | Orbicularis Oculi |
| puckers the lips | Orbicularis oris |
| flattens the cheeks | Buccinator |
| smiling muscle | Zygomaticus |
| sneering | Levator labii superioris |
| frowning | Depressor anguli oris |
| chewing | Mastication |
| lateral neck muscle and prime mover | Sternocleidomastoid |
| group of muscles on each side of the back | Erector Spinae |
| muscles that move the thorax | Thoracic muscles |
| rotates scapula | Trapezius |
| pulls scapula anteriorly | Serratus anterior |
| adducts and flexes the arm | Pectoralis major |
| medially rotates, adducts, and extends the arm | Latissimus dorsi |
| attaches humorous to the scapula and clavicle | Deltoid |
| extends the forearm. Occupies the posterior compartment | Triceps brachii |
| flexes the forearm. Occupies the anterior compartment | Biceps brachii |
| flexes forearm | Brachialis |
| flexes and supinates the forearm | Brachioradialis |
| holds extensor tendons and holds them in place around the wrist | Retinaculum (bracelet) |
| flexes the wrist | Flexor Carpi |
| extends the wrist | Extensor Carpi |
| flexes the fingers | Flexor digitorum |
| extends the fingers | Extensor digitorum |
| buttocks | Gluteus maximus |
| extends the leg | Quadriceps femoris |
| flexes the thigh | Sartorius |
| muscles- posterior thigh muscles | Hamstring |
| form the calf muscle | Gastrocnemius and Soleus |
| lateral muscles of the leg | Peroneus |
| 20 muscles located within the foot | Intrinsic foot |
| The charge difference across the membrane is called | Resting membrane potential |
| The brief reversal back of charge is called | Action potential |
| Enlarged nerve terminal | Synaptic cleft |
| Each branch that connects to the muscle forms a | Neuromuscular junction |
| muscle fiber | Postsynaptic terminal |
| each presynaptic terminal contains | Synaptic vesicles |
| secrete a neurotransmitter called | Acetylcholine |
| The sliding of actin myofilaments past myosin myofilaments during contraction | Sliding filament mechanism |
| level that the stimulus has to reach for muscle fiber to respond to stimulus | Threshold |
| the increase in number of motor units being activated is called | Recruitment |
| ATP | Adenosine Triphosphate |
| is produced in the mitochondria | ATP |
| is short-lived and unstable | ATP |
| ADP | Adenosine diphosphate |
| Another high-energy molecule that can be stored | Creatine Phosphate |
| without oxygen | Anaerobic Respiration |
| with oxygen | Aerobic respiration |
| results when ATP is used during muscle contraction | Muscle Fatigue |
| Refers to constant tension produced by muscle of the body for long periods of time | Muscle Tone |
| contract quickly and fatigue quickly | Fast-Twitch fibers |
| contract more slowly | Slow-Twitch fibers |
| most stationary end of the muscle | Origin |
| the end of the muscle undergoing the greatest movement | Insertion |
| the portion of the muscle between the origin and the insertion | Belly |
| muscles that work together to accomplish specific movements | Synergists |
| Muscles that work in opposition to one another | Antagonists |
| one muscles plays the major role in accomplishing the desired movement | Prime mover |
| Each Z line is an attachment site for | Actin |
| accomplishes quiet breathing | Diaphragm |
| elevate the ribs during inspiration | External intercostals |
| contract during forced expiration | Internal intercostals |
Created by:
brooklynxa
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