ch10pt1

Question 1

muscle cell (or fiber)

Answer 1

myocyte

Question 2

skeletal muscle is comprised of (4)

Answer 2

muscle tissue, connective tissues, nerves, and blood vessels

Question 3

layers of connective tissues in muscles (3)

Answer 3

epimysium, perimysium, endomysium

Question 4

outer collagen layer surrounding entire muscle

Answer 4

epimysium

Question 5

separates muscle from surrounding tissues

Answer 5

epimysium

Question 6

surrounds muscle fiber bundles (fascicles)

Answer 6

perimysium

Question 7

brings blood vessel and nerve supply to fascicles

Answer 7

perimysium

Question 8

surrounds individual muscle cells/fibers

Answer 8

endomysium

Question 9

contains capillaries and nerve fibers for muscle cells

Answer 9

endomysium

Question 10

Contains myosatellite cells (stem cells) that repair damage

Answer 10

endomysium

Question 11

collagen fibers from all three muscle layers come together at ______

Answer 11

end of muscle

Question 12

connective tissue at end of muscles may attach to

Answer 12

bone matrix

Question 13

bundle of collagen at the end of a muscle

Answer 13

tendon

Question 14

sheet of collagen at the end of a muscle

Answer 14

aponeurosis

Question 15

connection of muscle pulls on

Answer 15

attached bone

Question 16

skeletal muscles are _____ ______, controlled by nerves of the ___ ___ ___.

Answer 16

voluntary muscles, central nervous system

Question 17

supply large amounts of oxygen, carries away wastes, supply nutrients (glucose, fatty acids)

Answer 17

skeletal muscle’s extensive vasculature

Question 18

skeletal muscles develop through fusion of

Answer 18

myoblasts

Question 19

multinucleate cells have increased production of

Answer 19

proteins and enzymes

Question 20

myoblasts which don’t fuse to become muscle fibers

Answer 20

become myosatellite cells

Question 21

aid in muscle repair

Answer 21

myosatellite cells

Question 22

cell membrane of a muscle fiber

Answer 22

sarcolemma

Question 23

the sarcolemma surrounds the

Answer 23

sarcoplasm (cytoplasm for muscle cell)

Question 24

change in ______ ______ triggers muscle contraction

Answer 24

transmembrane potential

Question 25

narrow tubules reaching deep into myocyte. continuous with sarcolemma.

Answer 25

transverse tubules (T tubules)

Question 26

T tubules transmit ___ ___ through a cell, allow entire muscle fiber to ____ ____.

Answer 26

action potential, contract simultaneously

Question 27

lengthwise subdivisions (threads) within a muscle fiber

Answer 27

myofibrils

Question 28

myofibrils are made up of a bunch of ____. they are responsible for muscle contraction

Answer 28

myofilaments (protein filaments)

Question 29

types of myofilaments (2)

Answer 29

thin and thick

Question 30

myofilament type made mostly of the protein actin

Answer 30

thin filaments

Question 31

myofilament type made of the protein myosin

Answer 31

thick filaments

Question 32

Myofilaments are organized into repeating pattern along the length of the myofibril causing

Answer 32

striations

Question 33

Stores high concentrations of calcium. A membranous structure surrounding each myofibril

Answer 33

sarcoplasmic reticulum (SR)

Question 34

specialized smooth endoplasmic reticulum (SER) found in muscle cells

Answer 34

sarcoplasmic reticulum (SR)

Question 35

SR forms chambers called ____ ____ attached to T tubules

Answer 35

terminal cisternae

Question 36

formed by one T tubule and two terminal cisternae

Answer 36

Triad

Question 37

a repeating pattern of myofilaments. creates a striped or striated pattern within myofibrils

Answer 37

sarcomere

Question 38

structural unit forming myofibrils. The smallest contractile units of muscle.

Answer 38

sarcomere

Question 39

(within a sarcomere) thick, dark filaments are ______ and thin, light filaments are ______.

Answer 39

A bands, I bands

Question 40

where I band meets an I band in a sarcomere

Answer 40

Z line

Question 40

The center of the A band, and technically the sarcomere. Connects thick filaments to each other

Answer 40

M line

Question 41

area around the M line. Has thick filaments only. no thin filaments

Answer 41

H band

Question 42

The densest, darkest area on a light micrograph. Where thick and thin filaments overlap.

Answer 42

Zone of overlap

Question 43

Where thick and thin filaments interact (contraction occurs)

Answer 43

Zone of overlap

Question 44

__ line connects thin filament (I band) to thin filament. The __ line connects thick filaments (A band) to thick filament.

Answer 44

Z line, M line

Question 45

stabilizes/returns a sarcomere to its original shape. Has elastic properties

Answer 45

titin