Write the difference between: (a) Actin and Myosin (b) Red and White muscles (c) Pectoral and Pelvic girdle | NCERT solution | Class 11 Biology | Unit-20 Locomotion and Movement



Q.5:- Write the difference between:
(a) Actin and Myosin
(b) Red and White muscles
(c) Pectoral and Pelvic girdle

 

Answer

(a) Actin and Myosin

Actin
Myosin
Actin is a thin contractile protein. Myosin is a thick contractile protein.
The light bands called I-band or Isotropic band contain actin. The dark band called ‘A’ or Anisotropic band contains myosin.

(b) Red and White muscles

Red Muscles
White Muscles
Red muscle fibres are thin and smaller in size. White muscle fibres are thick and larger in size.
They are red in colour as they contain large amounts of myoglobin. They are white in colour as they contain small amounts of myoglobin.
They contain plenty of mitochondria. They contain less number of mitochondria.
They provide energy by aerobic respiration. They provide energy by anaerobic respiration.

(c) Pectoral and Pelvic girdle



Pectoral
Pelvic girdle
Pectoral girdle is situated in the pectoral region of the body. Pelvic girdle is situated in the pelvic region of the body.
It is composed of two bones namely, clavicle or collar bones and scapula or shoulder bone. It is composed of three bones, upper ileum, inner pubic, and ischium.
It has no articulation with the vertebral column. It has articulation with the vertebral column.
These perform functions like holding, lifting etc. These perform functions like running, standing, jumping etc.