Exam 2- Muscular System

Question 1

List and define the functional features of muscle tissue
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Answer 1

Contractility
Excitability
Extensibility
Elasticity

Question 2

lining of intestine, involuntary, no striation

Answer 2

Smooth

Question 3

involuntary, heart, branched, inverted disc

Answer 3

Cardiac

Question 4

striated, voluntary, multi-nuclei, cylindric

Answer 4

Skeletal

Question 5

structure of muscle organ

Answer 5

Epimysium:
Perimysium:
Endomysium:
Muscle Fiber:
Myofibrils:
Sarcomere

Question 6

a long row of repeating segments called sarcomeres

Answer 6

Myofibrils

Question 7

z disc(line), thin (actin) filament, thick (myosin) filament

Answer 7

Sarcomere

Question 8

A band, H band (zone), M line, I band

Answer 8

Sarcomere structure:

Question 9

Key Function of Muscle Tissue
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Answer 9

Movement
Posture
Joint stabilization
Heat Production

Question 10

Structure of skeletal muscle organs down to the sarcomere, including the mysiums.
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Answer 10

Epimysium
Perimysium
Endomysium
Muscle Fiber
Myofibrils
Sarcomere

Question 11

Surround the entire muscle

Answer 11

Epimysium

Question 12

Surrounds fascicles

Answer 12

Perimysium

Question 13

Surrounds individual muscle fibers

Answer 13

endomysium

Question 14

Contains myofibrils

Answer 14

muscle fibers

Question 15

contains sarcomeres

Answer 15

Myofibrils

Question 16

smallest contractile unit

Answer 16

sarcomere

Question 17

Sarcomeres
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Answer 17

Z line
I band
A band
H zone
M line
Actin (thin filament)
Myosin (thick filament)

Question 18

They anchor the thin filaments (actin) and connect sarcomeres together. Dark proteins called connection in the center of I band where thin filament attach

Answer 18

Z lines

Question 19

Protein filaments attached to the Z-discs that interact with myosin to cause contraction.

Answer 19

Actin ( thin filaments )

Question 20

Protein filaments located in the center of the sarcomere. They have heads that bind to actin during contraction

Answer 20

Myosin ( thick filament)

Question 21

The length of the thick filaments (myosin), including the zone where actin overlaps with myosin. It remains constant during contraction. Dark band in the middle of the sarcomere, comprised of entire thick filament and on its lateral end region of overlapping thin filament

Answer 21

A band

Question 22

The region containing only thin filaments (actin) and shrinks during muscle contraction as the filaments slide. Light band containing thin filaments only and connectin proteins

Answer 22

I-band

Question 23

The center of the A-band, where there’s only myosin (thick filaments) and no overlap with actin. It gets smaller during contraction. Lighter region in the middle of the A band; contains thick filament only

Answer 23

H zone

Question 24

The middle of the sarcomere, where thick filaments are anchored. A thin transverse meshwork that appears as a dark protein disc in center of H zone where thick filament attach

Answer 24

M line

Question 25

During contraction, Blank and Blank filaments slide past each other, shortening the sarcomere and leading to muscle contraction without changing the lengths of the individual filaments

Answer 25

actin and myosin

Question 26

Cells BLANK are known as fibers

Answer 26

Smooth & skeletal

Question 27

Two types of myofilaments:

Answer 27

Actin (thin filament) Myosin ( thick filaments)

Question 28

1) Blank bind to troponin 2) Troponin pulls back tropomyosin. Exposes the Blank 3)Myosin heads bind to actin binding site forming a Blank 4) This causes the actin to slide past the myosin shortening the

Answer 28

1-Calcium 2-active binding sites 3-cross bridge 4- sarcomere

Question 29

muscle contraction 1)Blank release binding to receptors 2) BLANK reaches T Tubules 3)Sarcoplasmic reticulum releases Blank 4) Active exposure BLANK formation 5) Contraction begin

Answer 29

1-AcH 2-Action potential 3- Calcium 4- cross bridge

Question 30

functional contractile unit of skeletal muscle, the distance between two adjacent Z disc

Answer 30

sarcomere

Question 31

Does it shorten/narrow when the skeletal muscle contracts 1- sarcomere- 2-a band- 3-h zone- 4-m line- 5-I band- 6-z disc -

Answer 31

1- yes 2-no 3-yes 4-no 5-yes 6-no

Question 32

-the width of the BLANK band remains constant -the blank zone disappears -the I band narrow or shorten in lenght - the Blank disc in one sarcomere move closer together - The blank narrows or shorten in length

Answer 32

-A -H -I -Z -Sarcomere

Question 33

Neuromuscular junction 1- Blank travel down motor neuron 2-Blank reaches the end of the neuron 3-Vesicle with BLANK release BLANK across the motor neuron 4-ACH discuss across the BLANK 5- ACH BLANK to ACH receptor 6-Sodium channel open causes impulse to travel along BLANK 7-Blank breaks down Ach and bring it back to motor neuron

Answer 33

1-Actin 2-Impulse 3-ACH 4-cleft 5-bind 6- sarcolemma 7-AchE

Question 34

slow myosin ATPase contract over long period of time without fatigue

Answer 34

slow oxidative fiber , type I fibers

Question 35

fast myosin ATPase . produce fast, powerful contraction with ATP provided primarily through aerobic respiration.

Answer 35

Fast oxidative (FO) fiber, intermediate fibers or type IIa

Question 36

largest in diameter and contain fast myosin ATPase powerful contraction, but only for a short duration.

Answer 36

Fast glycolytic (FG) fibers- fast anaerobic fibers or type IIx fibers,