Ch 10

Question 1

Whole skeletal muscle

Answer 1

Epimysium

Question 2

Surrounds a fasicle

Answer 2

Perimysium

Question 3

Surrounds individual muscle fibers within muscle fasicle

Answer 3

Endomysium

Question 4

Less movable bone

Answer 4

Origin

Question 5

Where bone moves

Answer 5

Insertion

Question 6

Make up individual muscle cells

Answer 6

Myofibrils

Question 7

Each myofibril is organized into repeated segments
Basic unit of contraction

Answer 7

Sarcomere

Question 8

Outer boundaries
Attached to each & extend toward sarcomere are actin

Answer 8

Z line

Question 9

Make up sarcomere

Answer 9

Actin and myosin

Question 10

Overlapping actin and myosin
Darker portions of striations

Answer 10

A band

Question 11

Only thin actin
Lighter region of striations

Answer 11

I band

Question 12

Only myosin thick, expands from M line

Answer 12

H line

Question 13

Crosses middle of H zone attachment point for myosin

Answer 13

M line

Question 14

Smooth ER of muscle cells
Surround each myofibrils

Answer 14

Tubules of SR

Question 15

End portion of SR
Stores Ca

Answer 15

Terminal cisterns

Question 16

Deep invaginations of sarcolemma run bw each pair of terminal cisterns

Answer 16

T tubules

Question 17

T tubule and 2 terminal cisterns

Answer 17

Triad

Question 18

Each contains an active site for myosin heads to bind

Answer 18

G-actin (globular protein)

Question 19

2 G-actin strands make up

Answer 19

F-actin (filamentous)

Question 20

G-actin molecule bind to

Answer 20

Nebulin

Question 21

Strands cover active sites on G-actin in resting state

Answer 21

Tropomyosin

Question 22

3 subunits, globular
Bind to tropomyosin, to G-actin, Ca if not resting

Answer 22

Troponin

Question 23

Muscles shorten

Answer 23

Concentric

Question 24

Muscles lengthen

Answer 24

Eccentric muscle contraction

Question 25

Contract slow, fatigue resistant, a lot mitochondria, capillaries, and myoglobin Red color

Answer 25

Slow oxidative fibers

Question 26

Contract quick, fatigue quick, force- big muscle, less mitochondria, few capillaries, no myoglobin

Answer 26

Fast glycolytic fibers

Question 27

Contract quick but not as fast (intermediate), mitochondria, capillaries, and myoglobin

Answer 27

Fast oxidative fibers