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Muscles Quiz1
The muscles of the body
| Question | Answer |
|---|---|
| Contractility | Ability of skeletal muscle to shorten with force. |
| Excitability | Caoacityof skeletal muscle to respond to a stimulus. |
| Four Characteristics of skeletal muscles | Contractility,excitability,extensibility, elasicity |
| Connective tissue located outside the epimysium? | Fascia |
| connective tissue sheath surrounding the skeletal muscle? | epimysium |
| fasciculi are composed of? | single muscle cells called fibers |
| muscle fasciculi are surrounded by? | lose connective tissue called perimysium |
| what occurs in the absence of oxygen? | anerobic respiration |
| muscle fibers that fatigue quickly | fast twitch |
| muscle fibers that are resistant to fatigue | slow twitch |
| what raises the eyebrows | capiton frontalis |
| two types of tongue muscles | interior, exterior |
| what closes the eyelids | orbicularis occuli |
| what is actin myofilaments | thin myofilaments |
| myosin myofilaments | thick myofilaments |
| what is sarcomeres | basic structural and functional unity of the muscle. |
| Erector spinae | group of muscles on each side of the back. |
| what is the erector spinae responsible for | for keeping the back straight and the body erect |
| Thoracic Muscles | muscles that move the thorax |
| Leg Movements | Quadriceps femoris & Sartorius |
| Sartorius | “tailors muscle”; flexes the thigh |
| Quadriceps femoris | extends the leg; anterior thigh muscles |
| Hamstring muscles | flexes the leg and extends the thigh |
| Gastrocnemius and soleus form what | calf muscles |
| Flexor carpi | flexes the wrist |
| Extensor carpi | extends the wrist |
| Flexor digitorum | flexes the fingers |
| Extensor digitorum | extends the fingers |
| Triceps brachii | extends the forearm. Occupies the posterior compartment of the arm |
| BEGINING OF A CONTRACTION | lag phase |
| time of contraction | contraction phase |
| time when muscle relaxes | relaxation phase |
| tetany | muscle remains contracted without relaxing |
| where is ATP produced | mitochondria |
| when ATP is used faster than it is produced | muscle fatigue |
| anaerobic respiration | without oxygen |
| aerobic respiration | with oxygen |
| muscle fatigue | when ATP is being used faster than it is produced |
| isometric | length stays the same tention increases |
| isotonic | amont of tention is constantduring contraction |
| muscle tone | constant tention produced by musles of the body for long periods of time |
| origin | most stationary end of the muscle |
| insertion | end of the muscle undergoing greatest movemnt |
| part of muscle between the origin and the insertion is called? | belly |
| each sarcomere extends from what? | Z line |
| enlarged nerve terminal | presynaptic terminal |
| muscles that work together to acomplish speccificmovements are called | synergists |
| muscles that work in opposition of eachother are called | antagonists |
| Trapezius | rotates scalpula |
| serratus anterior | pulls scapula anteriorly |
| arm is attached to the? | thorax |
| pectoralis major | adducts and flexes arm |
| "swimmer muscles" | latissimus dorsi |
| deltoid | attaches the humerous to the scalpula and clavical |
| gluteus maximus | buttocks |
| gluteus medius | hip muscle |
| common injection site | gludeus medius |
| quadriceps femoris | extends the leg |
| sartorius | flexes thigh |
| extends thigh | hamstring |
| gastronemius and soleus | form the calf muscle |
| lateral muscle of the leg | peronous |
| 20 muscles located in the foot | intrinsic foot |
| prime mover | one who plays a major role in accomplishing the desired movement |
| two major kind of protin fibers | actin and myosin |
| resting membrane potential | charge difference across membranes |
| action potential | the breif reversal back of charge |
| synaptic vesicles | secrete a neurotransmitter |
| acetylcholine | neurotransmitter |
| synaptic cleft | muscle cell |
| motor unit | form single muscle |
| motor neurons | nerve cells that carry actin potentials |
| all or none response | reaches threshold or doesnt |
| broken down by enzymes | acetylcholinesterase |
| A band extends the length of ? | myosin |
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sarahnapier4
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