MCQ
Agnatha includes
- ✓Hag fishes
- BFishes
- CJelly fishes
- DFlying fishes
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$R -$ Cross bridge is formed only in presence of $ATP,$ while breaking of cross bridge is in absence of $ATP.$
$(i)$ All the cells of the epithelium are held together with little intercellular materials.
$(ii)$ In almost all animal tissues specialized junction provide both structural and functional link between its individual cells.
$(iii)$ Tight junctions help to stop substances from leaking across a tissue.
$(iv)$ Adhering junctions provide cementing to keep neighbouring cells together.
$(v)$ Gap junctions provide cytoplasmic channels between cells for passage of ions, small molecules and sometimes big molecules.
| List-l | List-Il |
| (A) Cartilaginous Joint | (I) Do not allow any movement |
| (B) Pivot joint | (II) Between adjacent vertebrae in vertebral column |
| (C) Fibrous Joint | (III) Between carpal and metacarpal of thumb |
| (D) Saddle Joint | (IV) Between atlas and axis |