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. |
Column I | Column II | ||
(a) | Pivot joint | (i) | Between atlas and axis |
(b) | Gliding joint | (ii) | Between the carpals |
(c) | Ball and socket joint | (iii) | Knee joint |
(d) | Saddle joint | (iv) | Between humerus and pectoral girdle |
(v) | Between carpal and metacarpal of thumb |
(a) | Binding of calcium with the subunit of tropomyosin removes the masking of active sites for myosin |
(b) | Z-lines move towards the centre of ‘H’ zone |
(c) | Cross bridge is formed by utilising the energy from hydrolysis of ATP |
(d) | H-zone disappears when a muscle fibre is maximally contracted |