PCB3703L, Chapter3, Skeletal Muscle Physiology

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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


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