(P) Lec 3.2: Muscular Tissue Flashcards

PPT-based

1
Q

part of the cytoplasm

A

sarcoplasm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

part of the cell membrane and external lamina

A

sarcolemma

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

part of the ribosomes

A

sarcosomes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

part of the the smooth ER

A

Sarcoplasmic reticulum

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

All muscle cells are derived from

A

Mesoderm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

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

A

Skeletal Muscle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

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

A

F (skeletal)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Large numbers of parallel skeletal muscle fibers are grouped into?

A

fascicles or bundles—arrangement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

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

A

sarcolemma (cell membrane surrounding a skeletal muscle fiber)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

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

A

SKELETAL

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

external sheath of dense connective tissue that encloses the entire muscle

A

epimysium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

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

A

Perimysium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

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

A

endomysium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

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

A

Sarcomere

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

dark bands are called the

A

A band or anisotrophic bands

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

they are doubly refractile or birefringent under polarized light

A

A band or dark banks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

they do not alter polarized light

A

light bands or I bands

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

center of the A band is a pale zone termed

A

H band

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

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

20
Q

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

A

Ca+++ ions

21
Q

The depolarization of sarcoplasmic reticulum membrane is initiated at a?

A

specialized myoneuronal junction

22
Q

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

A

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)

23
Q

end-to-end repetitive arrangement of sarcomeres

A

myofibrils

24
Q

2 types of filaments of skeletal

A

myosin filaments and actin

25
principal constituent of the A band
thicker myosin filaments
26
Bound to opposite side of each T-tubule processes are expanded
terminal cisternae of the sarcoplasmic reticulum
27
This specialized complex, consisting of Sr-T tubule – SR components, is known as the?
“triad of skeletal muscle”.
28
a 40-nm-long coil of two polypeptide chains located in the groove between the two twisted actin strands
tropomyosin
29
a complex of three subunits: TnT, which attaches to tropomyosin; TnC, which binds Ca2+; and TnI, which regulates the actin-myosin interaction
Troponin
30
skeletal muscle: mechanism of contraction is due to
sliding or overlapping of the myofilaments
31
Cross striated, cylindrical or elongated, OFTEN branching muscle fibers
Cardiac Muscle
32
Contraction is involuntary, vigorous, and rhythmic.
Cardiac muscle
33
ALSO encloses the cardiac muscle
connective tissue sheath
34
what main junction is present in the intercalated discs?
zonula adherens
35
Three main junctional specializations within the discs
- Fascia adherens (Fascia junctions) & Desmosomes (Maculae adherens) - Gap junctions
36
T or F. The contractile substance in the same interdigiting relationship as that of skeletal muscle.
T
37
T or F. The cardiac muscle's sarcoplasmic reticulum is well organized compared to skeletal muscle fibers.
F (not well organized)
38
Lack striations and contraction is relatively slow
Smooth or Visceral
39
slow, steady contraction under the influence of autonomic nerves and various hormones
Smooth or visceral
40
identify muscle tissue: Myofilaments criss-cross obliquely through the cell, forming a latticework network
Smooth
41
T or F. All muscle tissue forms a sarcomere.
F (smooth lang walang sarcomere)
42
T or F. The contractile unit is the smooth muscle cell itself.
T
43
T or F. The calcium regulating sarcoplasmic reticulum is greatly reduced in skeletal muscle tissue.
F (smooth)
44
T or F. Visceral tissue is not regularly arranged as that of striated muscles
T
45