Question | Answer |
The ability to be stretched | Extensibility |
occipitofrontalis | raises eyebrows |
The ability of skeletal muscle to be shortened with force. | contractibility |
The capacity of skeletal muscle to respond to a stimulus. | excitablity |
ability to recoil to their original resting length after they have been stretched. | elasticity |
epimysium | each skeletal muscles is surrounded by connective tissue sheath |
zygomaticus | smiling muscle |
the most stationary end of the muscle | origin or head |
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 |
what is ATP? | adenosine triosphate |
buttocks | gluteus maximus |
hip muscle commmonly called the buttox | gluteus medius |
muscles that work together are? | synergists |
levator labii superioris | sneering |
platysma | pulls corners of lips downward |
thin myofilaments | actin myofilaments |
thick myofilaments | myosin myofilaments |
where the muscle remains contracted without relaxing | tetany |
forehead | frontalis |
when the limb movs toward the body midline. | adduction |
movement of the bone around its longitudinal axis | rotation |
moving the limb away from the midline | abduction |
what are the three types of muscle tissue | skeletal, cardiac, and smooth |
what is the end of the muscle undergoing the greatest movement | insertion |
what is the muscle that plays the major roll in accomplishing the desired movement | prime mover |
what closes the eyelid | orbicularis oculi |
what is the buccinator | flattens the cheeks |
what is the depressor anguli oris | sneering muscle |
orbicularis oris | puckers the lips |
what is the stynocleidomastoid | lateral neck muscle |
what are the two kissing muscles | obicularis oris and buccinator |
chewing | mastication |
what are two characteristics of the cardiac muscle | involtentary and not straited |
what is a muscle fiber | endomysium |
what is a time of contraction | contraction phase |
when does aerobic exercise take place | in the prsence of oxygen |
when does anerobic exercise take place | in the absence of oxygen |
what are the two types of muscle contractions | isometric and isotonic |
what are two types of fibers | fast twitch and slow twitch |
muscle fibers are resistant to fatigue | slow twitch |
muscles that work opposite of each other | antagonist |
the point where the muscle fiber will contract maximally | threshhold |
each fiber is surrounded by a connective tissue sheath called what? | endomysium |
the increase in the number of motor units being activated | recruitment |
what is the brief reversal back of the charge | action potential |
what iss produced in the mitochondria | ATP |
what is short lived and unstable | ATP |
what results when ATP is used during muscle contraction faster than it can be produced | muscle fatigue |
what is the portion of the muscle between the origion and the insertion | belly |
what is the constant tension produced by muscles of the body for long periods of time | muscle tone |
what contracts quickly and fatigue quickly | fast-twitch fibers |
contracts slow | slow- twitch fibers |
the length of the muscle will not change but the amount of tension increases | isometric |
the amount of tension produced by the muscle is constant during contraction | isotonic |
the amount of oxygen needed in chemical reactions to covert lactic acid | oxygen debt |
without oxygen | anaerobic respiration |
with oxygen | aerobic respiration |
when muscles rest and they cant stockpile ATP but they can store another high energy molecule | creatine phosphate |
what is packaged into the organs | skeletal muscle fibers |
what is found in only one place in the body which is the heart | cardiac muscle |
deltoid | abducts humerus |
calcaneal tendon | achilles tendon |
triceps | arm muscle |
trapezius | extends neck and adducts scapula |
erector spinae | extends back |
latissimus dorsi | extends and adducts humerus |
soleus | arises on the tibia |
gastronemius | forms the curved calf on the posterior leg |
extensor digitorium | arises from the lateral tibialis |
sartorius | compared to other thigh muscles described here, the thin, straplike sartorius |
sternocleidomastoid | muscles are two-headed muscles, one found on each side of the neck |
when the fascicals arranged in conconcentric | circular |
fascicles converge toward a single insertion tendon | convergant |
the length of the fascicles run parallel to the long axis of the muscle | parallel |
short fasciclas attach obliquely to the central tendon | pennate |