Answer:
(a) Differences between Actin and Myosin
(b) Differences between Red and White Muscles
S.N.
Action
Myosin
1.
2.
3.
4.
These are thin filaments.
Actin has low molecular weight
filamentous protein,
The thin filament also contain the
contractile protein called
tropomyosin.
It is a rod-shaped fibrous protein.
These are thick filaments.
Myosin has high molecular weight
small globular proteins.
Each myosin molecule also has two
components, a tail and a head
It is a globular protein.
(c) Differences between Pectoral and Pelvic Girdle
S.N
Red Muscles
White Muscles
1.
2.
3.
In some muscles, myoglobin content is high, which gives a
reddish colour to them, such muscles are called red
muscles,
These contain plenty of mitochondria.
These are called aerobic muscles.
Some muscles possess very less quantity of
myoglobin, so they appear whitish called as
white muscles.
These have less number of mitochondria but
amount of sarcoplasmic reticulum is high.
They depend on anaerobic process of energy.
S.N.
Pectoral Girdle
Pelvic Girdle
1.
2.
3.
4.
5.
It helps in the articulation of upper
limbs, limbs.
It is situated in the pectoral region of
the body.
Each help of pectoral girdle is formed
of a clavicle and a scapula,
Scapula is a large triangular, flat bone
and clavicle is a long slender bone.
An expanded process, acromion from
scapula forms a depression called
glenoid cavity, which articulates with
the head of humerus to form shoulder
joint.
It helps in the articulation of lower
It is situated in the pelvic region of
the body.
Pelvic girdle consists of two coxal
bones.
Each coxal bone is formed of three
bones, ischium and pubis.
Ilium, ischium and pubis fuse at a
point to form a cavity called
acetabulum to which the thigh
bone articulates.
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