muscle tissue

Question 1

Each muscle cell contains ___ . Individual ___ are composed of thick and thin __ which are responsible for contraction.

Answer 1

myofibrils
myofibrils
myofilaments

Question 2

Thick and thin myofilaments overlap in the darker __ band and only thin myofilaments are present in the lighter __ band

Answer 2

A

I

Question 3

Within a fascicle, an individual myocyte is surrounded by reticular fibers which form the

Answer 3

endomysium (separates muscle fibers)

Question 4

Each fascicle is surrounded by dense irregular connective tissue called

Answer 4

perimysium( contains muscle fibers)

Question 5

Most muscles are surrounded on the outer surface by a dense irregular connective tissue layer called

Answer 5

epimysium (covers the muscle)

Question 6

sarcolemma invaginations at the A-I band junction in mammals and at the Z line in amphibians

Answer 6

T tubules

Question 7

In skeletal muscle , each T tubule form a

Answer 7

triad
center= t tubule
sids - SER

Question 8

SER stores

Answer 8

calcium

Question 9

What is a motor unit composed of

Answer 9

A nerve fiber and the muscle cell to innervates

Question 10

The point of attachment of a nerve within a skeletal muscle fiber

Answer 10

motor end plate

Question 11

What are the three binding sites for troponin

Answer 11

Binds with tropomyosin
binds with actin
binds with calcium

Question 12

What happens in rigor mortis

Answer 12

ATP is depleted the filaments cannot detach

Question 13

Red skeletal muscle fibers (Type I) get energy from what pathway. White muscle fibers?

Answer 13

Oxidative pathway

Glycolytic pathway

Question 14

These fibers contract and fatigue slowly , slow twitch fibers

Answer 14

red fibers

Question 15

More extensive SER, rapid release of calcium , fast twitch fibers

Answer 15

white fibers

Question 16

regeneration of skeletal muscle

Answer 16

depend on extent of injury
small areas of muscle can be regenerated through fusion of satellite cells with each other to form new muscle cells or fusion with existing muscle cells
if damage is extensive, skeletal muscle cells is replaced by connective tissue

Question 17

in cardiac muscle, t tubules are located where

The SER forms a __ - t tubule and 1 see on one side

Answer 17

at z lines

diad

Question 18

Cardiac muscles contain intercalated disk that contain :

Answer 18

gap junctions
desmosomes
fascia adherens (located between desmosomes)

Question 19

what are purkinje fibers

Answer 19

impulse conducting, modified cardiac fibers located in interventricular septum
they occur in groups

Question 20

in cardiac muscles , calcium is released from where

Answer 20

SER and t tubules

Question 21

is there regeneration in cardiac m. cells

Answer 21

no

but can be repaired by proliferation of connective tissue rather than regeneration

Question 22

nuclei in skeletal m.

Answer 22

multi nucleated and located at peripheral

Question 23

nuclei in cardiac m.

Answer 23

nucleus is in center of cell, intercalated disks

Question 24

smooth muscle cell shape

Answer 24

spindle -shaped, elongated

Question 25

Smooth muscle lacks troponin, what does calcium bind with in smooth muscle

Answer 25

calmodulin protein

Question 26

smooth muscle lack t tubules

Answer 26

true

Question 27

Gap junctions in smooth muscle are located in sarcolemma are called

Answer 27

nexus

Question 28

what is unitary smooth muscle

Answer 28

contract at 1 time as a unit .spreads from cell to cell by gap junctions

Question 29

unitary skeletal muscle is found

Answer 29

in the viscera of digestive system

Question 30

what is multi unit skeletal muscle

Answer 30

triggered by a nerve impulse, lack gap junctions, results in reduced coordination between cells

Question 31

multi skeletal muscle examples

Answer 31

constrictor and dilator muscle cells of the iris

Question 32

regeneration of skeletal muscle cells

Answer 32

it is limited

healing of new smooth m cells is mainly through connective tissue scar formation

Question 33

which muscle has highest regeneration

Answer 33

smooth muscle

Question 34

purkinje fibers vs cardiac fibers

Answer 34

are less striated
contain more glycogen
diameter is larger than in cardiac fiber