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57 terms

Anatomy Chapter 9

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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