(P) Lec 3.2: Muscular Tissue

Question 1

part of the cytoplasm

Answer 1

sarcoplasm

Question 2

part of the cell membrane and external lamina

Answer 2

sarcolemma

Question 3

part of the ribosomes

Answer 3

sarcosomes

Question 4

part of the the smooth ER

Answer 4

Sarcoplasmic reticulum

Question 5

All muscle cells are derived from

Answer 5

Mesoderm

Question 6

cross-striations and cylindrical/elongated with blunt ends muscle cell with diameters of 10-100 μm.

Answer 6

Skeletal Muscle

Question 7

T or F. The cardiac muscle is referred to as “fiber”

Answer 7

F (skeletal)

Question 8

Large numbers of parallel skeletal muscle fibers are grouped into?

Answer 8

fascicles or bundles—arrangement

Question 9

The nuclei (of skeletal muscle) are found at the periphery or eccentric under the?

Answer 9

sarcolemma (cell membrane surrounding a skeletal muscle fiber)

Question 10

contraction is quick, forceful, and usually under voluntary control.

Answer 10

SKELETAL

Question 11

external sheath of dense connective tissue that encloses the entire muscle

Answer 11

epimysium

Question 12

A thin septa of dense connective tissue that immediately surrounds each bundle of muscle fibers termed a fascicle

Answer 12

Perimysium

Question 13

Delicate layer of loose connective tissue (fibers and scattered fibroblasts) that surrounds the external lamina of individual muscle fibers; INSIDE THE FASCICLE

Answer 13

endomysium

Question 14

the functional and structural unit of contraction in skeletal muscle; extends from Z disc to Z disc

Answer 14

Sarcomere

Question 15

dark bands are called the

Answer 15

A band or anisotrophic bands

Question 16

they are doubly refractile or birefringent under polarized light

Answer 16

A band or dark banks

Question 17

they do not alter polarized light

Answer 17

light bands or I bands

Question 18

center of the A band is a pale zone termed

Answer 18

H band

Question 19

center of this H band is a narrow dark line, known as the

Answer 19

M band

Question 20

depolarization of sarcoplasmic reticulum membrane, which results in the release of

Answer 20

Ca+++ ions

Question 21

The depolarization of sarcoplasmic reticulum membrane is initiated at a?

Answer 21

specialized myoneuronal junction

Question 22

To provide for a uniform contraction, skeletal muscles posses a system of?

Answer 22

transverse (T) tubules (fingerlike invaginations of the sarcolemma that form a complex anatomosing network of tubules that encircle both A-I junctions of each sarcomere in every myofibril)

Question 23

end-to-end repetitive arrangement of sarcomeres

Answer 23

myofibrils

Question 24

2 types of filaments of skeletal

Answer 24

myosin filaments and actin

Question 25

principal constituent of the A band

Answer 25

thicker myosin filaments

Question 26

Bound to opposite side of each T-tubule processes are expanded

Answer 26

terminal cisternae of the sarcoplasmic reticulum

Question 27

This specialized complex, consisting of Sr-T tubule – SR components, is known as the?

Answer 27

“triad of skeletal muscle”.

Question 28

a 40-nm-long coil of two polypeptide chains located in the groove between the two twisted actin strands

Answer 28

tropomyosin

Question 29

a complex of three subunits: TnT, which attaches to tropomyosin; TnC, which binds Ca2+; and TnI, which regulates the actin-myosin interaction

Answer 29

Troponin

Question 30

skeletal muscle: mechanism of contraction is due to

Answer 30

sliding or overlapping of the myofilaments

Question 31

Cross striated, cylindrical or elongated, OFTEN branching muscle fibers

Answer 31

Cardiac Muscle

Question 32

Contraction is involuntary,
vigorous, and rhythmic.

Answer 32

Cardiac muscle

Question 33

ALSO encloses the cardiac muscle

Answer 33

connective tissue sheath

Question 34

what main junction is present in the intercalated discs?

Answer 34

zonula adherens

Question 35

Three main junctional specializations within the discs

Answer 35

• Fascia adherens (Fascia junctions) & Desmosomes (Maculae adherens)
• Gap junctions

Question 36

T or F. The contractile substance in the same interdigiting relationship as that of skeletal muscle.

Answer 36

T

Question 37

T or F. The cardiac muscle’s sarcoplasmic reticulum is well organized compared to skeletal muscle fibers.

Answer 37

F (not well organized)

Question 38

Lack striations and contraction is relatively slow

Answer 38

Smooth or Visceral

Question 39

slow, steady contraction under the influence of autonomic nerves and various hormones

Answer 39

Smooth or visceral

Question 40

identify muscle tissue: Myofilaments criss-cross obliquely through the cell, forming a latticework network

Answer 40

Smooth

Question 41

T or F. All muscle tissue forms a sarcomere.

Answer 41

F (smooth lang walang sarcomere)

Question 42

T or F. The contractile unit is the smooth muscle cell itself.

Answer 42

T

Question 43

T or F. The calcium regulating sarcoplasmic reticulum is greatly reduced in skeletal muscle tissue.

Answer 43

F (smooth)

Question 44

T or F. Visceral tissue is not regularly arranged as that of striated muscles

Answer 44

T