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CH.6 Muscles.


Muscle Cells Muscle Fibers
Buttocks Gluteus Maximus
Chest Muscle Pectoral Muscle
Anterior Thigh Muscle Quadriceps Femoris
Posterior Thigh Muscle Hamstrings
Back Muscle Latissimus Dorsi
Muscle responsible for smiling Zygomatics
Muscle responsible for sneering Levator labil superioris
Muscle responsible for frowning Depressor anguli oris
Close the eyelid Orbicularis oculi
Ability of skeletal muscle to shorten with force Contractility
Skeletal muscle to respond to a stimulus Excitability
Ability to be stretched Extensibility
Ability to recoil to their original resting length Elasticity
Four Major Function Contractility, Excitability, Extensibility, Elasticity
Flattens the cheeks Buccinator
Changes the shape of the tongue Intrinsic tongue muscles
Moves the tongue Extrinsic tongue muscles
Adenosine triphosphate ATP
The connective tissue sheath surrounding each skeletal muscle epimysium
The connective tissue located outside the epimysium Fascia
Connective tissue surrounding fascicle Perimysium
Fasciculi are composed of a single muscle cell Fibers
connective tissue surrounding each fiber Endomysium
Each fiber is filled with a threadlike structure that extends from one end to another Myofibrils
Myofibrils consist of 2 major kinds of protein fibers Actin myofilaments, Myosin Myofilaments
the ability of skeletal muscle to shorten with force contractility
skeletal muscle to respond to a stimulus excitability
ability to be stretched extensibility
ability to recoil to original resting length elasticity
muscles help produce what heat
sheath surrounding skeletal muscle epimysium
connective tissue located outside the epimysium fascia
muscle composed of numerous bundles fasciculi
loose connective tissue covering fasciculi perimysium
single muscle cells in fasciculi fibers
each fiber is surrounded by a connective tissue sheath called endomysium
each muscle fiber is a single cylindrical cell containing several nuclei
cytoplasm of each fiber is filled with myofibrils
a thread like structure the extends from one end of the fiber to another myofibrils
two major kinds of protein fibers actin myosin
thin myofilaments actin
thick myofilaments myosin
this resembles 2 minute strands of pearls twisted together actin
resemble bundles of minute golf clubs myosin
actin and myosin form highly ordered units sarcomeres
the basic structural and functional unit of the muscle sarcomere
extends from 1 z line to another z line sarcomere
each z line is an attachment site for actin
the arrangement of actin and myosin give a banded appearance
on each side of the z line is a light area called an I band
consists of actin I band
darker central region in each sarcomere a band
in the center of the sarcomere is another light area called h zone
consists of only myosin h zone
the myosin myofilaments are anchored in the center of the sarcomere at a dark staining band called m line
the brief reversal back of the charge action potential
nerve cells that carry action potentials to skeletal muscle fibers motor neurons
each branch that connects to the muscle neuromuscular junction
another word for neuromuscular junction synapse
a single motor neuron and all the skeletal muscle fibers it innervates motor unit
many motor units muscle
a neuromuscular junction is formed by an enlarged nerve terminal resting in an indentation of the muscle cell membrane
the enlarged nerve terminal presynaptic terminal
the space between the presynaptic terminal and the muscle cell synaptic cleft
each presynaptic terminal contains synaptic vesicles
synaptic vesicles secrete a neurotransmitter called acetylcholine
diffuses across the synaptic cleft and binds to the postsynaptic terminal acetylcholine
when sarcomeres shorten it causes the muscle to shorten
a contraction of an entire muscle in response to a stimulus muscle twitch
threshold level where muscle fibers will contract maximally all-or-none response
time between application of a stimulus to a motor neuron and the beginning of a contraction lag phase
muscle remains contracted without relaxing tetany
increase in number of motor units being activated recruitment
needed for muscle contraction ATP
produced in the mitochondria ATP
ATP degenerates to the more stable ADP
Created by: parkeo123