1. | the myosin head binds to the exposed active sites on actin utilising the energy from ATP hydrolysis |
2. | the myosin head binds to the exposed active sites on actin and then the ATP binds to its site on myosin head |
3. | the actin binds to the exposed active sites on myosin head utilising the energy from ATP hydrolysis |
4. | the actin binds to the exposed active sites on myosin head and then the ATP binds to its site on actin |
Statement I: | The myosin, hydrolysing ATP into ADP and Pi goes back to its relaxed state. |
Statement II: | Cross bridge is broken when myosin releases ADP and Pi. |
1. | Myosin goes back to its relaxed state. |
2. | A cross bridge is formed. |
3. | Ca2+ ions are pumped back to the sarcoplasmic cisternae. |
4. | Lactic acid accumulates in the muscle |
Statement I: | Repeated activation of the muscles can lead to fatigue. |
Statement II: | Repeated activation of the muscles can lead to the accumulation of lactic acid due to anaerobic breakdown of glycogen in them. |
1. | Statement I is correct; Statement II is correct |
2. | Statement I is correct; Statement II is incorrect |
3. | Statement I is incorrect; Statement II is correct |
4. | Statement I is incorrect; Statement II is incorrect |
I: | Myoglobin content is very low in the red fibres. |
II: | white muscle fibers contain plenty of mitochondria. |
III: | The amount of sarcoplasmic reticulum is high in red muscle fibers. |
IV: | White muscle fibres depend on anaerobic process for energy. |
I: | Axial skeleton comprises 80 bones distributed along the main axis of the body. |
II: | The skull is composed of 22 bones. |
III: | Cranial bones are 14 in number. |
IV: | The facial region is made up of 8 skeletal elements which form the front part of the skull. |
Statement I: | A single U-shaped bone called hyoid is present at the base of the buccal cavity and it provides attachment to the tongue. |
Statement II: | The skull region articulates with the superior region of the vertebral column with the help of two occipital condyles (dicondylic skull). |
Statement I: | First seven pairs of the ribs are called true ribs and are attached to the thoracic vertebrae and ventrally connected to the sternum with the help of elastic cartilage. |
Statement II: | The 8th, 9th and 10th pairs are false ribs and join the seventh rib with the help of elastic cartilage. |
I: | Each limb is made of 30 bones. |
II: | Carpals are 8 in number |
III: | Tarsals are 7 in number |
IV: | Metacarpals are 5 in number |
V: | Metatarsals are 4 in number |
I: | is a part of the pectoral girdle. |
II: | articulates with acromion process of scapula and with sternum |
III: | is commonly called the collar bone. |