Question 5 Write the difference between:
(a) Actin and Myosin
(b) Red and White muscles
(c) Pectoral and Pelvic girdle
Class - XI - Biology Chapter Locomotion and Movement Page No. 314
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(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 less 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.
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 less 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.
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