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

Question

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

cdquestions Admin · Accepted Answer

(a) Actin and Myosin                            Actin                                      Myosin 1 Actin is a thin contractile protein. 1 Myosin is a thick contractile protein.  2 It is present in light bands and is called an isotropic band. 2 It is present in dark bands and is called an anisotropic band.  (b) Red and White muscles    Red muscle fibre            White muscle fibre 1 Red muscle fibres  are thin and smaller in size. 1  White muscle fibres are thick and larger in size. 2 They are red in colour as they contain large amounts of myoglobin. 2 They are white in colour as they contain small amounts of myoglobin.  3 They contain numerous mitochondria. 3 They contain a smaller number of mitochondria.  4 They carry out slow and sustained contractions for a long period. 4 They carry out fast work for short duration. 5  They provide energy by aerobic respiration. 5 They provide energy by anaerobic respiration. (c) Pectoral and Pelvic girdle Pectoral girdle Pelvic girdle  1 It is a skeletal support from where the forelimbs of vertebrates are attached. 1 It is a skeletal support form where the hind limbs of vertebrates are attached. 2 It is composed of two Bones namely, clavicle or collar bones and scapula or shoulder bone. 2 It is composed of three bones, upper ileum, inner pubic, and ischium.

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

Solution and Explanation

Questions Asked in CBSE Class XI exam

	Actin		Myosin
1	Actin is a thin contractile protein.	1	Myosin is a thick contractile protein.
2	It is present in light bands and is called an isotropic band.	2	It is present in dark bands and is called an anisotropic band.

Red muscle fibre		White muscle fibre
1	Red muscle fibres are thin and smaller in size.	1	White muscle fibres are thick and larger in size.
2	They are red in colour as they contain large amounts of myoglobin.	2	They are white in colour as they contain small amounts of myoglobin.
3	They contain numerous mitochondria.	3	They contain a smaller number of mitochondria.
4	They carry out slow and sustained contractions for a long period.	4	They carry out fast work for short duration.
5	They provide energy by aerobic respiration.	5	They provide energy by anaerobic respiration.

Pectoral girdle		Pelvic girdle
1	It is a skeletal support from where the forelimbs of vertebrates are attached.	1	It is a skeletal support form where the hind limbs of vertebrates are attached.
2	It is composed of two Bones namely, clavicle or collar bones and scapula or shoulder bone.	2	It is composed of three bones, upper ileum, inner pubic, and ischium.