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How much of the total body weight of the average adult is muscle tissue?

30-40%

The different types of muscle tissue differ from each other by:

microscopic anatomy, location, type of control

Which of the following is NOT a major function of muscle tissue?

storing energy

This is the property of muscle that gives it the ability to stretch without damage.

extensibility

This is a band of connective tissue that surrounds the whole muscle

epimysium

When connective tissue extends as a broad flat layer, the tendon is referred to as:

aponeurosis

After the fusion of myoblasts, the muscle fiber loses its abilitiy to do what?

go through mitosis

The mitochondria in muscle fiber are arranged:

in rows throughout the muscle close to the myofibrils

These are the contractile organelles of the muscle fiber.

myofibrils

This part of the skeletal muscle cell releases calcium when stimulated by the T tubules:

terminal cisterna of sarcoplasmic reticulum

The sarcoplasmic reticulum is used for storing:

Ca+2

Which of the following contain thin filaments in a relaxed sarcomere?

I band and A band

Which of the following contains thick filaments?

zone of overlap, darker portion of A band, H zone

Myofibrils contain:

contractile proteins, regulatory proteins, structural proteins

Which of the following functions as a motor protein in all three types of muscle tissue?

myosin

What regulatory protein can be found on an actin molecule?

tropomyosin and troponin

Titin is found in a sarcomere:

from M line to Z disc

Which of the following is used to reinforce the sarcolemma?

dystrophin

In the sliding filament mechanism, the thin filament is being pulled towards:

M line

The sarcoplasmic reticulum releases calcium ions into the cytosol:

at the beginning of a contraction

What energizes the myosin head?

ATP hydrolysis reaction

The fascia surrounding a muscle is made up of:

fibrous connective tissue

According to the sliding filament theory:

actin moves past myosin

ATP is necessary for:

muscle contraction, relaxation, and calcium re-uptake by the sarcoplasmic reticulum

The T-tubule system involves:

sarcolemma or cisternae of sarcoplasmic reticulum

Myofibrils are composed primarily of:

actin and myosin

Excitability refers to the ability of a cell to:

respond to a stimulus by producing an electrical signal

The oxygen-binding protein found in skeletal muscle fibers is:

myoglobin

Muscle contraction is triggered by impulses carried over:

motor neurons

The sarcoplasmic reticulum:

stores Ca+2 when the fiber is at rest

A muscle fascicle is surrounded by:

perimysium

Elasticity refers to the ability of a muscle fiber to:

return to original shape after contracting or stretching

Calcium ions move from the cytoplasm (sarcoplasm) into the sarcoplasmic reticulum because of the action of:

active transport pumps in the sarcoplasmic reticulum membrane

When ATP attaches to the myosin head:

the head detaches from the actin

When calcium ion concentration in the sarcoplasm is low the:

troponin-myosin complex slides back over the myosin binding sites

The _______ is responsible for the striations of striated muscle.

alternating of A bands and I bands

The binding of Ca+2 to _______ starts the contraction cycle.

troponin

Which of the following properties of muscle tissue is its ability to generate tension to do work?

excitability

Various connective tissue wrappings surround various parts of muscle tissue. From an individual fiber to the entire muscle, these are:

endomysium, epimysium, perimysium

The inside region of a T tubule is continuous with the extracellular space.

true

Triads are paired terminal cisternae of sarcoplasmic reticulum on either side of a T tubule.

true

The arrival of an action potential in a T tubule causes the opening of Ca+2 channels in the adjacent sarcoplasmic reticulum and the release of Ca+2 into the sarcoplasm.

true

In isometric contraction, muscle tension does not overcome load.

true

In muscle twitches, a contracts faster than it relaxes.

true

The twitch contractions of some muscles (muscles of the eyeball) are more rapid and brief than other muscles (muscles of calf).

true

"I Bands" shorten during contraction

true

Actin (thin myofilaments) and myosin (thick filaments) shorten during contraction.

false

Due to the presence of superficial and deep fascia, the most-used tools in animal dissection are scalpels and scissors

false

Normally, flexing one's elbow requires some muscles on one side to use ATP to contract while other muscles on the other side use ATP to extend.

false

Muscle fibers get wider during hypertrophy

true

During rigor mortis the formation of numerous crossbridges are responsible for the resistance of muscle to passive movement (shortening and lengthening) by someone trying to reposition the body.

true

Hours of practice pays off in sport's activities by increasing the numbers of muscle cells in muscles that are in use.

false

Order from smallest to largest

myofilament, myofibrils, myofiber, fasiculi, muscle

Able to contract by shortening and thickening

contractility

Able to return to resting length after stretching

elasticity

Membrane has a high voltage potential able to transmit an action potential

Irritability/Excitability

Tissue is able to stretch without damange

extensibility

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