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Anatomy Ch 6 Muscles

Name the 4 major functional characteristics of skeletal muscle. Contractility,Excitability, Extensibility, and Elasticity
The connective tissue shealth that surrounds skeletal muscle. the epimysium
another connective tissue that surrounds and seperates muscles. the fascia
the ability of skeletal muscle to shorten with force Contractility
the visible bundles that make up muscles muscle fasciculi (fascicle)
loose connective tissue that surrounds the bundles perimysium
muscle cells are called muscle fibers
the capacity of skeletal muscle to respond to a stimulus excitability
the connective tissue sheath surrounding each fiber is called the endomysium
the ability of muscle to recoil to it's original resting length elasticity
a threadlike structure that extends from one end of the fiber to the other myofibrils
the 2 major kinds of protein fibers found in these threadlike structures are actin myofilaments and myosin myofilaments
highly ordered units of these protein fibers sarcomeres
the ability of muscle to be stretched extensibility
resting membrane potential is the charge difference across the membrane
action potential is the brief reversal back of charge
nerve cells that carry action potentials to skeletal muscle fibers are motor neurons
another name for a neuromuscular junction is a synapse
a single motor neuron and all the skeletal muscle fibers it innervates are called a motor unit
what does aceylcholine do it is a neurotransimitter
what is the space between the presynartic terminal and the muscle cell called the synaptic cleft
what is the presynaptic terminal the enlarged nerve terminal
what is the postsynaptic terminal the muscle fiber
what is the purpose of the sliding filament mechanism allows muscles to contract
the contraction of the entire muscle in response to a stimulus is muscle twitch
the level the stimulus must reach for a muscle fiber to react is threshold
when the muscle contracts maximally all-or-none response
the time between application of a stimulus to a motor neuron is called the lag phase
the tim of contraction is the contraction phase
time during which the muscle relaxs is called the relaxtion phase
muscles remain contracted without relaxing is tetnany
the increase in number of motor units being activated is recruitment
ATP stands for adenosine triphosphate
where is ATP produced in the mitochondria of the cell
what does ADP stand for adenosine diphosphate
what is creatine phosphate a high-energy molecule
anaerobic respiration without oxygen
aerobic respiration with oxygen(more efficent)
what is oxygen debit the amount of oxygen needed in chemical reactions
what causes muscle fatigue ATP is used during muscle contraction faster than it can be produced in the muscle cells
what does isometric mean the length of the muscle stays the same but the tension changes
what is muscle tone the constant tension produced by muscles of the body for long periods of time
describe fast-twitch fibers they contract quickly and fatique quickly
describe slow-twiwch fibers contract more slowly and are more resistant to fatique
what is the origin of the muscle the most starionary end of the muscle
what is the insertion of the muscle the end of the muscle undergoing the greatest movement
what is the section of the muscle between the origin and the insertion called the belly
muscles that work together are called synergists
muscles that work opposing each other are called antagonists
the muscle that plays thr major role in the movementis called the prime mover
the occipitofrontalis is responsible for raising the eyebrows
the obicularis oculi is responsible for opening and closeing the eyelids
What are the two "kissing muscles" called the orbicularis oris and the buccinator
what muscle is responsible for puckering the lips the orbicularis oris
what muscle flatens the cheeks the buccinator
another name for the"kissing muscles" the " trumpeter muscles"
what muscle makes you smile the zygomaticus
what muscle makes you sneer the levator labii superioris
what does the depresser anguli oris do make you frown
the lateral neck muscle sternocleidomastoid
what does the platysma do pull the corners of the mouth down
chewing mastication
extrinsic tongue muscle do what control tongue movement
interinsic tongue muscles do what control tongue shape
where are the erector spinae located on either sid eof the vertebral column
wha does the erector spinae do provide good posture
where are the intercostals located between the ribs
external intercostals are for inspiration
internal intercostals are for experation
what is the diaphram responible for quiet breathing
what is the diaphram a dome shaped muscle
what is the liea alba a white line of connective tissue that extends from the sternum to the pubis
what do the external obliques responible for helping compress abdominal contents
what are tendonous inscriptions tendonous tissue that crosses the rectus abdominis
what gives the rectus abdominous it's segmented look the tendonous inscriptions
Created by: edan213