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Anatomy ch.6 muscles

muscle flash cards

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
Four major functional characteristics contractility, excitability, extensibility, and elasticity
Each skeletal muscle is surrounded by a connective tissue sheath called the epimysium.
__________ is another connective tissue located outside the epimysium. It surrounds and separates muscles. Fascia
Myofibrils consist of 2 major kinds of protein fibers: actin myofibrils and myosin myofilaments
thin myofilaments. they resemble 2 minute strands of pearls twisted together. actin myofibrils
thick myofilaments. they resemble bundles of minute golf clubs. myosin myofilaments
actin and myosin myofilaments form highly ordered units called ____________.
each sarcomere extends from one ___ line to the other___ line. z
are nerve cells that carry action potentials to skeletal muscle fibers. motor neurons
a single motor neuron and all the skeletal muscle fibers it innervates are called a ___________. motor unit
axons enter the muscles and branch. each branch that connects to the muscles forms a _______________, or _________ near the center of the cell neuromuscular function, synapse
is a contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers. muscle twitch
the time between application of a stimulus to motor neuron and the beginning of a contraction is the ___________. lag phase
the time of contraction is the ___________. contraction phase
the time during which the muscle relaxes is the ______________. relaxation phase
where the muscle remains contracted without relaxing . tetany
the increase un number of motor units being activated is called_________. recruitment
ATP (adenosine triphosphate)
ATP is produced in ______________. mitochondria
without oxygen
with oxygen aerobic respiration
the ___________is the amount of oxygen needed in chemical reactions to convert lactic acid to glucose and to replenish and depleted stores of creatine phosphate stores in muscle cell. oxygen debt
results when ATP is used during muscle contraction faster than it can be produced in the muscle cells. muscle fatigue
what are the two types of muscle contraction? isometric and isotonic
(equal distance) the length of the muscle does not change, but the amount of tension increases during the contraction process. isometric
(equal tension) the amount of tension produced by the muscle is constant during a contraction, but the length of the muscle changes. isotonic
refers to constant tension produced by muscles of the body for long periods of time. Keeps head up and back straight. muscle tone
constant quickly and fatigue quickly. Well adapted to perform anaerobic metabolism. fast twitch fibers
contract more slowly and are more resistant to fatigue. they are better suited for aerobic metabolism. slow twitch fibers
the ___________ is the end of the muscle undergoing the greatest movement. insertion
the portion of the muscle between the origin and the insertion is the _________. belly
muscles that work together to accomplish specific movements are called ______________. synergists
muscles that work in opposition to one another are called ______________. antagonist
among a group of synergists, if one muscle plays the major role in accomplishing the desired movement, it is the __________________. prime mover
occipitofrontalis raises the eyebrows
oribicularis oculi closes the eyelids and causes "crows feet" wrinkles in he skin at the lateral corners of the eye.
orbicularis oris puckers the lips.
buccinator flattens the cheeks. Trumpeter's muscle. Obricularis oris and buccinator are the kissing muscles.
zygomaticus smiling muscle
levator labii superioris sneering
depressor anguli oris frowning
mastication chewing
4 pairs of mastication muscles 2 pair of pteryoids, temporalis, ad masseter.
intrinsic tongue muscle change the shape of tongue
move the tongue
lateral neck muscle and prime mover. rotates and abducts the head sternocleidomastoid
muscles that move thorax thoracic muscles
rotates scapula trapezius
pulls scapula anteriorly serratus anterior
the arm is attached to the ___________________________________-. pectoralis ajor and lastissmus dorsi muscles
adducts and flexes the arm pectoralis major
medically rotates, adducts, and powerfully extends the arm. "Swimmer muscles" latissimus dorsi
attaches the humerus to the scapula and clavicle, and is the major abductor of the upper limb deltoid
extends the forearm. occupies the posterior compartment of the arm. triceps brachii
flexes the forearm. occupies the anterior compartment of the arm. biceps brachii
flexes forearm. brachialis
flexes and supinates the forearm. brachioradialis
strong band of fibrous connective tissue that covers the flexor and extensor tendons and holds them in place around the wrist so hat they do not "bowstring" during muscle contraction retinaculum
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: anterior thigh muscles quadriceps femoris
"tailors muscle" flexes the thigh sartorius
posterior to the thigh muscle; flexes the leg and extends the thigh hamstring muscle
form the calf muscle. they join to form the calcaneal tendon (achilles tendon). flex the foot and toes. gastrocnemius and soleus
20 muscles located within the foot, called the _________muscles flex extend, abduct, and adduct the toes. intrinsic foot
group of muscles on each side of the back. responsible for keeping the back straight and the body erect. erector spinae
most involved in breathing external and internal intercostls
how many muscles are in the human body? 700
Created by: kaylen.asbury



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