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ch.6 muscles

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
Connective tissue sheath that surrounds skeletal muscle Epimysium
Connective tissue located outside the epimysium Fasica
A muscle is composed of numerous visible bundles called.. fasciculi (fascicle)
fasciculi are surrounded by this loose connective tissue called perimysium
what is the fasciculi composed of fibers
what are fibers single cylindrical cell containing several nuclei
fibers are surrounded by a connective tissue sheath endomysium
the cytoplasm of each fiber is called myofibrils
what is myofibrils a threadlike structure that extends from one end of the fiber to the other
the 2 major kinds of protein fibers actin and myosin myofilaments
thin myofilaments, resemble 2 minute strands of pearls twisted together actin myofilaments
thick myofilaments. resemble bundles of minute golf clubs myosin myofilaments
what do actin and myosin myofilaments form sarcomeres
the outside of most cell membranes are positively charged
the inside of most cell membranes are negatively charged
nerve cells that carry action potentials to skeletal muscle fibers motor neurons
enlarged nerve terminal is presynaptic terminal
space between the presynaptic terminal and the muscle cell is synaptic cleft
what does each presynaptic terminal contain synaptic vesicles
synaptic vesicles secrete a neurotransmitter called acetylcholine
the neuron and muscle cell is rapidly broken down by enzymes acetylcholinesterase
the sliding of actin myofilaments past myosin myofilaments during contraction sliding filament mechanism
muscle twitch contraction of an entire muscle in response to a stimulus
a muscle fiber will not respond to stimulus until that stimulus reaches a level called threshold
time between application of a stimulus to a motor neuron and the beginning lag phase
where the muscle remains contracted without relaxing tetany
the increase in number of motor units being activated is called recruitment
true or false: ATP is produced in the mitochondria true
what does ATP degenerates to the more stable.. ADP ( adenosine diphosphate)
Anaerobic respiration without oxygen
aerobic respiration with oxygen
what is oxygen debt the amount of oxygen needed in chemical reactions to convert lactic acid to glucose
muscle fatigue when ATP is used during muscle contractions faster than it can be produced in the muscle cells
isometric the length of the muscle does not change, but the amount of tension increases during the contraction process
isotonic the amount of tension produced by the muscle is constant during contraction
constant tension produced by muscles of the body for long periods of time muscle tone
contract quickly and fatigue quickly fast-twitch fibers
contract more slowly and are more resistant to fatigue slow-twitch fibers
the most stationary end of the muscle origin (head)
the end of the muscle undergoing the greatest movement insertion
True or False: Muscles only have one head/origins False; some muscles have multiple
Muscles that work together to accomplish specific movements are synergists
muscles that work in opposition to one another are called antagonists
raises the eyebrows occipitofrontslis
closes the eyelids orbicularis oculi
puckers the lips orbicularis oris
flattens the cheeks buccinator
smiling muscles zygomaticus
sneering levator labii superioris
frowing depressor anguli oris
chewing mastication
change the shape of tongue intrinsic tongue muscles
move the tongue extrinsic tongue muscles
lateral neck muscle and prime mover sternocleidomastoid
erector spinae group of muscles on each side of the back
elevate the ribs during inspiration external intercostals
contract during forced expiration internal intercostals
diaphragm accomplishes quiet breathing, dome shaped muscle
tendinous area of the abdominal wall is called linea alba
whats on each side of linea alba rectus abdominis
cross the rectus abdominis at three or more locations tendinous inscriptions
rotates scapula trapezius
pulls scapula anteriorly serratus
what is the arm attached to the thorax by pectoralis major and latissimus dorsi muscles
adducts and flexes the arm pectoralis major
medially rotates, adducts, and powerfully extends the arm latissimus dorsi
attaches the humerus to the scapula and clavicle and is the major abductor of the upper limb deltoid
extends the forearm triceps brachii
flexes the forearm biceps brachii
flexes forearm brachialis
flexes and supinates the forearm brachioradialis
Created by: kayyleaa
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