ch 10 muscle tissue
A single motor neuron and the skeletal muscle fibers it controls is called a ______.
motor unit
neuromuscular
pertaining to the relationship between a nerve and muscle
The cytoplasm of a skeletal muscle cell has a specific name and is known as
sacroplasm
Maintenance of posture and production of heat are functions of ______ muscle.
skeletal
the ______ filament theory explains how muscle fibers shorten during contraction.
sliding
As a result of ACh stimulation, calcium ions are released from the ______ of the sarcoplasmic reticulum.
terminal cisternae
endomysium
Connective tissue surrounding a muscle fiber
posture
Contraction of specific skeletal muscles stabilizes joints.
The epimysium of a muscle surrounds ______.
Entire skeletal muscle
The connective tissue layer that surrounds an entire muscle is called ______.
Epimysium
Deep invaginations of sarcolemma are called ______.
T-tubules
perimysium
The connective tissue that surrounds fascicles.
Storage and movement of materials
Voluntary sphincter muscles of the gastrointestinal and urinary tracts can be kept closed or opened.
sarcoplasm
cytoplasm of a muscle cell
A motor unit is composed of a single ______ and all of the muscle fibers it controls.
motor neuron
T-tubules (transverse tubules)
narrow, tubular extensions of the sarcolemma into the sarcoplasm
sarcolemma
plasma membrane of a muscle fiber
After stimulation of ACh receptors, a muscle impulse spreads quickly along the________ and into the muscle fiber along T-tubules.
sarcolemma
The plasma membrane of a skeletal muscle fiber is called the
sarcolemma
Muscle cells are said to have what characteristic because they can respond to stimulation from the nervous system?
Excitability
Muscle tissue demonstrates the property of _____ when it is done contracting and returns to its resting length.
elasticity
A skeletal muscle cell is also called a muscle
fiber
The outer layer of the muscle fiber is
fibers
1st neuromuscular junction
nerve signal arrives at synaptic knob
Approximately 40-50% of your body weight is _____ muscle.
skeletal
Attached to the skeleton and surrounding the openings of the urinary and gastrointestinal traces are locations of ______ muscle.
skeletal
sarcoplasmic reticulum (SR)
smooth ER reticulum in a muscle fiber
sarcoplasmic reticulum
specialized endoplasmic reticulum of muscle cells
Upon release from the terminal cisternae, some calcium ions bind to ______ causing it to change shape.
troponin
Temperature Regulation
Heat is produced as a waste product of energy usage.
Myofibrils
bundles of myofilaments within skeletal and cardiac muscle fibers
2nd neuromuscular junction step
calcium enters and binds synaptic vesicle
A muscle fiber is what level of organization in the body?
cellular
During the development of skeletal muscle cells, some myoblasts do not fuse and instead become ______ cells.
satellite
4th neuromuscular junction step
ACh binds receptors on the motor end plate
3rd neuromuscular junction step
ACh is released via exocytosis into the synaptic cleft
body movement
Muscles contract and pull on the tendons that attach the muscles to the bones.
nerve signal
Propagation of an action potential along a neuron
muscle fiber
a single muscle cell
When a nerve impulse reaches the end of an axon of a neuromuscular junction, calcium flows ______ the synaptic knob.
into
A contracting skeletal muscle fiber typically shortens as all of its ______ shorten in length.
sarcomeres
At the end of muscle contraction, calcium ions are moved back into the_________ reticulum by ATP-driven ion pumps
sarcoplasmic