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anatomy test

The ability of skeletal muscle to shorten with force contractility
2 major kinds of protein fibers actin and myosin
What is extensibility? the ability to be stretched
The capacity of skeletal muscle to respond to a stimulus excitability
The ability to recoil to their original resting length after they have been stretched elasticity
Connective tissue shealth that surrounds each skeletal muscle epimysium
connective tissue locate outside the epimysium fascia
What are fibers? Fasciculi that are composed of single muscle cells
Connective tissue sheath that that surrounds each fiber endomysium
myofibrils A threadlike structure that extends from one end of the fiber to the other
It resembles two strands of pearls actin
It resembles bundles of minute golf clubs myosin
Actin and myosin form highly ordered units called sacromeres
Extends from Z line to Z line sarcromere
A bands contain myosin
I bands contain actin
The space between the A bands is called the H zone
Nerve cells that carry action potentials to skeletal muscle fibers motor neurons
The charge difference across the membrane is called the resting membrane potential
The brief reversal back of the charge is called action potential
A single motor neuron and all the skeletal muscle fibers it innervates motor unit
presynaptic terminal the enlarged nerve terminal
the space between the presynaptic terminal and the muscle cell synaptic cleft
postsynaptic terminal the muscle fiber
acetylcholine a neurotransmitter in the presynaptic terminals
acetylcholinesterase when the acetylcholine is released into the synaptic cleft between the neuron and muscle cell
The sliding of actin myofilaments past myosin myofilaments during contraction sliding filament mechanism
muscle twitch a contraction of an entire muscle in response to a stimulus
threshold the point at which the muscle fiber will contract maximally
the time between application of a stimulus to a motor neuron lag phase
the time of the contraction contraction phase
the time during which the muscle relaxes relaxation phase
tetany where the muscle remains contracted without relaxing
recruitment the increase in number of motor untis being activated
anaerobic respriation without oxygen
aerobic respiration with oxygen
oxygen debt the amount of oxygen needed in chemical reactions
muscle fatigue results when ATP is used more than it can be produced
isometric equal distance
isotonic equal tention
muscle tone constant tension produced by the muscles of the body
fast-twitch fibers contract quickly and fatigue quickly
slow-twitch fibers contact slowly and fatigue slower
origin the most stationary end of the muscle
insertion the end of the muscle undergoing the most movement
belly the portion of the muscle between the origin and the insertion
synergists muscles that work together to accomplish specific movements
antagonists muscles that work in opposition of each other
the muscle that plays a major role accomplishing a movement prime mover
occipitofrontales raises the eyebrows
closes the eyelid orbicularis oculi
puckers the lips orbicularis oris
flatens the cheeks buccinator
zygomaticus smiling
levator labii superioris sneering
depressor anguli oris frowning
mastication chewing
extrensic tongue muscle moves the tongue
intrinsic tongue muscle changes the shape of tongue
sternocleidomastoid rotates and abducts neck
erector spine found on each side of the back responsible for posture
external intercostals contract during inspiration
internal intercostals contract during forced expiration
diaphragm dome-shaped muscle that is responsible for quiet breathing
rectus abdominus abs
linea alba connective tissue that extends from the sternum to the pubis
tendinous inscription cross the rectus abdominus in 3 places and form a segmented look in the abs
external abdominal obliques internal and transverse
deltoid attaches the humerus to the scapula and clavicle
flexor carpi flexes the wrist
extensor carpi extends the wrist
flexor digitorum flexes the fingers
extensor digitorum extends the fingers
gluteus maximus buttocks
quadriceps femoris extends the leg
sartorius flexes the thigh
Created by: BigAl24