A: | Muscle bundles are held together by collagenous connective tissue layer called fascicle. |
B: | Sarcoplasmic reticulum of muscle fibre is a store house of calcium ions. |
C: | Striated appearance of skeletal muscle fibre is due to distribution pattern of actin and myosin proteins. |
D: | M line is considered as functional unit of contraction called sarcomere. |
1. | C and D only | 2. | A, B and C only |
3. | B and C only | 4. | A, C and D only |
The type of muscles present in our:
1. | upper arms are smooth muscle fibres fusiform in shape |
2. | heart is involuntary and unstriated smooth muscles |
3. | intestine are striated and involuntary |
4. | thighs are striated and voluntary |