PCB3703L, Chapter3, Skeletal Muscle Physiology
Which of the following statements regarding tendons is NOT true? a. Tendons are dense regular connective tissue. b. Tendons are heavy in collagen fibers. c. Tendons connect muscles to bones. d. A rope-like tendon is called an aponeurosis.
A rope-like tendon is called an aponeurosis
What is found inside the synaptic vesicles? a. Calcium b. Acetylcholine c. Receptor proteins d. Acetylcholinesterase
Acetylcholine
A broad sheet of tendon.
Aponeurosis
I band
Composed primarily of actin
A band
Composed primarily of myosin
Endomysium
Connective tissue encasing a muscle fiber
Perimysium
Connective tissue surround fascicle
Epimysium
Connective tissue surrounding entire muscle
M line
Connects thick filament down center of sarcoere
Sarcoplasmic reticulum
Contains high calcium concentration
Myofibril
Cylindrical subunit of muscle fiber
Thick (myosin) filaments
Dense central region of sarcomere
Z disc
End line of a sarcomere; thin filaments anchored to it
Axon terminal
Forms neuron side of neuromuscular junction
Sarcomere
Functional subunit of myofibril
Synaptic cleft
Gap between axon terminal and motor end plate
Motor end plate
High folded region of sarcolemma; forms muscle side of neuromuscular junction
Which of the following statements regarding the motor end plate is NOT true? a. It contains membrane acetylcholine receptors. b. It is a specialized region of the sarcolemma c. It is the point of connection with the axon terminal. d. It allows Na+ into the muscle fiber when bound with AchE.
It allows Na+ into the muscle fiber when bound with AchE.
H Zone
Light region around M line
Thin (actin) myofilaments
Light region at each end of sarcomere
Mitochondria
Produces ATP for muscle fiber
Tendon
Rope-like bundle of dense connective tissue
Name for a muscle fiber plasma membrane.
Sarcolemma
Which of the following statements regarding sarcomeres is NOT true? a. Sarcomeres are overlapping thin and thick filaments. b. The sarcomere is a subunit found in the myofibril. c. Sarcomeres extend from one M line to the next M line. d. The position of the myofilaments in a sarcomere give it a banded appearance.
Sarcomeres extend from one M line to the next M line
_____ vesicles contain acetylcholine.
Synaptic
Rope-like bundles of dense regular connective tissue.
Tendon
Which of the following pairs is not correctly matched? a. Sarcolemma--muscle fiber plasma membrane b. Transverse tubule--holds high calcium concentration c. Mitochondria--produces ATP for muscle contraction d. Sarcomere--function unit of the myofibril
Transverse tubule--holds high calcium concentration
Acetylcholine (ACh)
a nuerotransmitter
Muscle fiber
a single muscle cell
The motor end plate contains _____ receptors.
acetylcholine
Primarily found in thin filaments.
actin
The portion of the motor neuron that forms part of the neuromuscular junction is the: a. synaptic cleft b. axon terminal c. myoneural neuron d. motor end plate
axon terminal
Fascicle
bundle of muscle fibers
The sarcoplasmic reticulum contains a high _____ concentration.
calcium
Transverse tubule
carries wave of depolarization through muscle fiber
The synaptic _____ is a gap between the motor end plate and the axon terminal.
cleft
Tendons are heavy in _____ fibers.
collagen
synaptic vesicles
contain acetylcholine (ACh)
Thin filaments are anchored to the Z _____ at the end of a sarcomere.
disc
A delicate connective tissue layer.
endomysium
The _____ is connective tissue surrounding the whole muscle.
epimysium
A _____ is a bundle of muscle fibers within a muscle.
fascicle
A single muscle cell is called a muscle _____.
fiber
The endomysium encases an infividual muscle _____.
fiber
The sarcomere is the _____ unit of a myofibril.
functional
Produces ATP to power muscle contraction.
mitochondria
The _____ neuron carries waves of depolarization to a muscle.
motor
Tendons attach _____ to bone.
muscle
The epimysium surrounds an entire _____.
muscle
A single muscle cell is called a: a. myofibril b. sarcomere c. muscle fiber d. myofilament
muscle fiber
Sarcolemma
muscle fiber plasma membrane
Appears banded due to myofilaments within sarcomeres.
myofibril
Cylindrical subunit of a muscle fiber.
myofibril
_____ is found in thick filaments.
myosin
The _____ junction is the point where a motor neuron connects with a muscle fiber.
neuromuscular
A fascicle is surrounded by _____.
perimysium
A fascicle is surrounded by: a. perimysium b. endomysium c. sarcomysium d. epimysium
perimysium
The sarcolemma is the muscle fiber's _____ membrane.
plasma
The sarcoplasmic _____ releases calcium into the muscle fiber.
reticulum
The M line connects thick filaments down the center of the _____.
sarcomere
Which of the following is the function unit of a myofibril? a. sarcomere b. myofilament c. sarcolemma d. endomysium
sarcomere
The t-tubule is continuous with the _____.
sarcomeres
Acetylcholinesterase is found in the _____ cleft.
synaptic
Aponeurosis
tendon is a broad, flat sheet
The axon _____ forms the neuron side of the neuromuscular junction.
terminal
Myosin is found in _____ filaments.
thick
The H zone contains only _____ filaments
thick
Actin is found in _____ filaments.
thin
The I band contains only _____ filaments.
thin
The _____ tubule carries depolarization waves throughout the muscle fiber.
transverse
Synpatic _____ contain ACh.
vesicles
Which of the following pairs is not correctly matched? a. I band--contains only think filaments b. Z disc--marks the middle of the sarcomere c. H zone--contains only thick filaments d. A band--light central region of sarcomere
z disc--marks the middle of the sarcomere
The H _____ is a lighter region around the M line.
zone
