Muscle 1

Question 1

Origin of muscle

Answer 1

more stationary and proximal attachment of muscle to a bone

Question 2

Insertion of muscle

Answer 2

the distal attachment of a muscle to bone

Question 3

Tendon

Answer 3

connective tissue that forms the attachment of muscle to bone

Question 4

Antagonistic pair

Answer 4

muscle pairs that act to move muscle in opposite directions, example: biceps-triceps, one flexes, one extends

Question 5

Skeletal muscle classification

Answer 5

cross striations, voluntary, CNS

Question 6

Cardiac muscle

Answer 6

cross striations, functional syncytium (contraction driven by pacemaker cells)

Question 7

Smooth muscle (visceral)

Answer 7

Lacks cross striations (smooth structure), Involuntary: driven by ANS

Question 8

T/F Skeletal muscles can push and pull.

Answer 8

FALSE. Can only pull

Question 9

Epimysium

Answer 9

connective tissue surrounding entire muscle

Question 10

Perimysium

Answer 10

connective tissue surrounding muscle fascicle

Question 11

Endomysium

Answer 11

connective tissue surrounding muscle fiber

Question 12

Sarcolemma

Answer 12

membrane surrounding muscle cell (neuron)

Question 13

T/F Skeletal muscle fibers are multinucleated

Answer 13

TRUE

Question 14

How are myofibrils arranged within a muscle

Answer 14

PARALLEL

Question 15

Myofibrils contain few or many sarcomeres

Answer 15

MANY

Question 16

When a muscle contracts, what pulls closer together?

Answer 16

the Z-lines get close (the I band disappears)

Question 17

Triad region in skeletal muscle

Answer 17

2 terminal cisternae and one t-tubule

Question 18

What stores calcium in the skeletal muscle

Answer 18

sarcoplasmic reticulum

Question 19

How does the Ca++ get into the sarcolemma

Answer 19

Through the t-tubules (invaginate in from within the sarcolemma)

Question 20

Sarcomere

Answer 20

the basic functional and anatomical unit of the contractile machinery of skeletal muscle

Question 21

How long are myofibrils

Answer 21

they run the entire length of the muscle

Question 22

What are the 2 internal membrane structures and what do they do?

Answer 22

Transverse tubules: extend inward from the sarcolemma

Sarcoplasmic reticulum: runs length of sarcomeres, right angles to t-tubules, site of Ca++ storage

Question 23

Z-line

Answer 23

boundary of the sarcomere; connects the ends of the thin filaments; z-line moves closer together during contractions

Question 24

A-band

Answer 24

composed of thick filaments arranged side by side (width remains constant during contraction)

Question 25

M-line

Answer 25

runs down the center of the A-band

Question 26

I-band

Answer 26

portion of thin filaments where there is no overlap with thick filaments; width narrows during contraction

Question 27

H-zone

Answer 27

region of the A-band into which thin filaments do not extend

Question 28

Thin filaments

Answer 28

Actin

Question 29

Thick filaments

Answer 29

Myosin

Question 30

Troponin/Tropomyosin complex

Answer 30

TnC binds Ca++ and allows the tropomyosin molecule to shift in the groove creating a situations where actin and myosin can interact

Question 31

Titin

Answer 31

cytoskeletal protein; large elastic protein that extends from the Z-line to the center of the sarcomere

Question 32

What does the Titin do?

Answer 32

Helps maintain the myosin interaction with actin

Question 33

Nebulin

Answer 33

structure of the actin molecules (organization and connection of actin to the Z-line)

Question 34

Myosin contains ___.

Answer 34

ATP and actin binding sites that project out in spiral fashion

Question 35

A-band

Answer 35

Overlap of thin and thick filaments