| Statement A: | The muscle bundles are bound together by a common collagenous sheath of connective tissue called fascia. |
| Statement B: | Muscle fibre is a syncytium as the sarcoplasm contains many nuclei. |
| 1. | Both statements A and B are correct |
| 2. | Both statements A and B are incorrect |
| 3. | Only statement A is incorrect |
| 4. | Only statement A is correct |
| a. | Sarcoplasmic reticulum of the muscle fibres is the storehouse of calcium ions. |
| b. | The type of muscles present in our thigh are striated and voluntary. |
| c. | The H-zone in the skeletal muscle fibre is due to the central gap between myosin filaments in the A-band. |
| d. | Production of body heat and storage of minerals are the functions of the skeletal system. |
| Column-I | Column -II | ||
| a. | I-band | (i) | Contains both thin and thick filaments |
| b. | A-band | (ii) | Elastic fibre that bisects I-band |
| c. | M-line | (iii) | Contains thin filaments |
| d. | Z-line | (iv) | Thin fibrous membrane |
| (a) | Locomotion, changes of body postures and heat production are some of the functions of skeletal muscle tissue |
| (b) | Actin filaments are firmly attached to the Z-line |
| (c) | The portion of myofibril between non-consecutive 'Z' lines is called sacromere |
| (d) | Muscles constitute more than 50% of the body weight in an adult human |
| a | b | c | d | |
| 1. | T | T | T | T |
| 2. | T | F | F | T |
| 3. | T | T | F | F |
| 4. | F | T | T | T |
| a. | ‘H’ zone decreases in length and disappears on full relaxation |
| b. | A band remains unchanged |
| c. | I band gets reduced in length due to decrease in length of actin filaments |
| d. | Myosin hydrolyses ATP, releasing ADP and P1 |
| e. | Z- lines move away from each other |
| List-I | List-II | ||
| (a) | Collar bone | (i) | Thoracic vertebrae, ribs, and sternum |
| (b) | Rib cage | (ii) | Long slender bone with two curvatures |
| (c) | Skull bones | (iii) | Pivot joint |
| (d) | Atlas and axis | (iv) | Sutures |
| (a) | In humans, the skull articulates with the axis vertebra with two occipital condyles. |
| (b) | The number of cervical vertebrae is seven in almost all mammals. |
| (c) | The bones of vertebral column form the cartilaginous joint. |
| (d) | The spinal curve formed due to thoracic vertebrae is convex anteriorly. |
| Statement A: | First seven pairs of ribs are ventrally connected to the sternum with the help of hyaline cartilage. |
| Statement B: | The last three pairs of ribs do not articulate directly with the sternum but join the seventh rib with the help of hyaline cartilage. |