MUSCULAR TISSUE

Question 1

What is muscular tissue?

Answer 1

A tissue of highly contractile nature made up of long elongated cells called muscle fibers.

Question 2

What are myofibrils?

Answer 2

Each muscle fibers constitutes of fine longitudinal fibrils called myofibrils.

Question 3

What is the cytoplasm of muscle fiber known as?

Answer 3

Sarcoplasm

Question 4

What is the membrane of sarcoplasm termed as?

Answer 4

Sarcolemma

Question 5

What is the origin of muscular tissue?

Answer 5

Mesodermal

Question 6

What are the types of muscular tissue?

Answer 6

1.Striated or striped or skeletal or voluntary muscular tissue
2.Unstriated or unstriped or involuntary muscular tissue
3.Cardiac tissue

Question 7

Striated muscles? shape, nucleus, arrangement, dark band, light band, h-band, z-band , location

Answer 7

structure-long, cylindrical with blunt ends
nucleus- acentric/syncytial
arrangement-myofibrils arranged into dark and light bands
Dark band-highly refractive, anisotropic band (A-band), mid point bisection-Henson’s line (H-band), formed of myosin protein.
Light band- non-refractive, isotropic band (I-band), mid point bisection- Krause’s membrane (Z-band), actin protein.
location- body wall, pharynx, esophagus, tongue
Voluntary, gets tired quickly

Question 8

Unstriated

Answer 8

shape-spindle, tapering at both ends
nucleus-single at middle
sarcolemma-absent
bands-none, so smooth
contraction-slow and prolonged, never gets tired
location- walls of alimentary canal, urinary bladder, blood vessels, genital tract
INVOLUNTARY, controlled by autonomic nervous system

Question 9

CARDIAC

Answer 9

Heart wall only, both properties, myogenic (contracts on its own without central nervous system interference)
shape-cylindrical interconnected by oblique bridges with stripes
presence of intercalated discs
do not get tired
supplied by cns(vagus nerve) and ans
INVOLUNTARY

Question 10

Difference between striated and unstriated

Answer 10

1.location
2.shape
3.nucleus
4.bands
5.sarcolemma
6. voluntary