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Seaton Lycan

Anatomy Chapter 6

Muscle Cells Muscle Fibers
The ability of skeletal muscle to shorten with force Contractibilty
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
Each skeletal muscle is surrounded by a connective tissue sheath called the.. Epimysium
Another connective tissue located outside the epimysium. It surrounds and seperates muscles Fascia
A muscle is composed of numerous visible bundles called muscle fasciculi, which are surrounded by loose connective tissue called the.. perimysium
Each fiber is surrounded by a connective tissue sheath called the.. endomysium
Thin myofilaments actin myofilaments
Thick myofilaments Myosin Myofilaments
Actin and mysoin myofilaments for highly ordered units called.. sarcomeres
Basic structural and functional unity of a muscle Sarcomere
On each side of the Z line is a light area called.. I band
The A band extends the length of what? The myosin
In the center of each sarcomere is another light area called the what? H Zone
The charge difference across the membrane is called the what? Resting membrane potential
nerve cells that carry action potentials to skeletal muscle fibers? Motor neurons
A single motor neuron and all the skeletal muscle fibers it innervates are called a what? Motor Unit
The enlarged nerve terminal is the what? presynaptic terminal
The space between the presynaptic terminal and the muscle cell is the what? Synaptic Cleft
Each presynaptic terminal contains what? synaptic vesicles
The sliding actin myfilaments past myosin myofilaments during contraction is called the what? sliding filament mechanism
a contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers is what? Muscle twitch
A muscle fiber will not respond to stimulus until that stimulus reaches a level called what? threshold
the time between application of a stimulus to a motor neuron and the beginning of a contraction is the what? lag phase
the time of contraction is the what? contraction phase
The time during which the muscle relaxes is the what? relaxation phase
Where the muscle remains contracted without relaxing Tetany
the increase in number of motor units being activated is called what? recruitment
When at rest muscle cells cant stockpile ATP but they can store another high-energy molecule called what? Creatine Phosphate
Without oxygen Anaerobic Respiration
With oxygen Aerobic respiration
the amount of oxygen needed in chemical reactions to convert lactic acid to glucose and to replenish the depleted stores of creatine phosphate stores in muscle cells oxygen debt
results when ATP is used during muscle contraction faster than it can be produced in the muscle cells Muscle Fatigue
The length of the muscle does not change, but the amount of tension increases during the contraction process isometric
the amount of tension produced by the muscle is constant during contraction, but the length of the muscle changes isotonic
constant tenstion produced by muscles of the body for long periods of time muscle tone
contract quickly and fatigue quickly fast-twich fibers
contract more slowly and are more resistant to fatigue slow-twitch fibers
group of muscles on each side of back trunk muscles
draw scapula toward vertebral column rhomboids
flexes, extends, and abducts the arm deltoid
"chest muscle" abducts and flexes the arm pectoralis major
pulls the scapula inferiorly pectoralis minor
quiet breathing diaphram
extends forearm triceps brachii
flexes and suppinates forearm biceps brachii
primary flexor of the forearm brachialis
elevate ribs during inspiration esternal intercostals
Created by: slycan42