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Ericas muscles

QuestionAnswer
contractility shorten with force.
excitability respond to a stimulus..
extensibility to be stretched.
elasticity recoil to their original length.
epimysium connective tissue surrounding the skeletal muscle.
fascia connective tissue located outside the epimysium. surrounds and separates muscles.
Perimysium fasciculi surrounded by connective tissue
fibers single muscle cells
endomysium type of connective tissue surrounding fibers.
myofibrils threadlike structure that extends from one end of the fiber to another.
Actin myofilaments resemble 2-minute strands of pearls twisted together.
myosin myofilaments resemble bundles of minute golf clubs.
sarcomeres basic structural and functional unit of the muscle.
z line attachment site for actin.
I band consists of actin.
a band extends the length of the myosin.
h zone in the center of each sarcomere.
m line the anchored in the center of the sarcomere.
resting membrane potential positively charged compared to the inside membrane which is negatively charged
action potential reversal back of the charge
motor neurons nerve cells that carry action potentials to skeletal muscle fibers
neuromuscular junction/ synapse connects muscle form near the center of the cell
motor unit skeletal muscle fibers it innervates
presynaptic terminal enlarged nerve terminal
postsynaptic terminal muscle fibers and synaptic cleft
synaptic cleft space between the presynaptic terminal and the muscle cell
synaptic vesicles each presynaptic contains
acetylcholine neurotransmitter
acetylcholinesterase broken down by an enzymes
sliding filament mechanism during contraction
muscle twitch contraction of an entire muscle
threshold stimulus reaches a level
all or none response phenomenon
lag phase beginning of a contraction
contraction phase time of contraction
relaxation phase muscle relaxes
tetany muscle remains contracted without relaxing.
recruitment being activated
creatine phosphate high-energy molecules
anaerobic respiration without oxygen
aerobic respiration with oxygen
oxygen debt amount of oxygen needed
muscle fatique when ATP is used during muscle contraction
isometric the length of the muscle does not change
isotonic amount of tension produced by the muscle
muscle tone refers to constant tension
fast twitch fibers contract quickly and fatigue quickly
slow twitch fibers contract slowly and more resistant to fatigue
synergists specific movements
antagonists opposition to on another
prime mover major role on accomplishing the desired movement
occipitofrontalis raises the eyebrow
orbicularis oculi closes the eyelids
orbicularis Oris puckers the lips
buccinator flattens the cheeks
zygomaticus smiling muscle
levator labii superioris sneering
depressor anguil Oris frowning
mastication chewing
stemocleidomastoid lateral neck muscle and prime mover
thoracic muscles muscles that move the thorax
external intercostals elevate the ribs during inspiration
internal intercostals contract during forced expiration
diaphragm accomplishes quiet breathing
mastication chewing
intrinsic tongue change the shape of the tongue
extrinsic tongue move the tongue
trapezius rotates scapula
serratus anterior pulls scapula anteriorly
pectoralis major adducts and flexes the arm
latissimus dorsi medially rotates, adducts, and powerfully extends the arm
deltoid attaches the humerus to the scapula and clavicle
triceps brachii extends the forearm
biceps brachii flexes the forearm
brachialis flexes forearm
brachioradialis flexes and supinates the forearm
flexor carpi flexes the wrist
extensor carpi extends the wrist
flexor digitorum flexes the fingers
extensor digitorum extends the fingers
Created by: El062707!
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