Question 5
Write the difference between:
(a) Actin and Myosin
(b) Red and White muscles
(c) Pectoral and Pelvic girdle
(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. (I-band) | 2 | It is present in dark bands and is called an anisotropic band.(A-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. |
