Tight junctions: Create a seal between adjacent cells, preventing the leakage of substances across the tissue. They prevent the passage of molecules between cells.
Adhering junctions: Provide strong mechanical attachments between adjacent cells, acting like “spot welds.” They don’t facilitate communication.
Gap junctions: Form channels between adjacent cells, allowing for the passage of ions, small molecules, and signals. They facilitate communication, not create gaps.
A bob of heavy mass \(m\) is suspended by a light string of length \(l\). The bob is given a horizontal velocity \(v_0\) as shown in figure. If the string gets slack at some point P making an angle \( \theta \) from the horizontal, the ratio of the speed \(v\) of the bob at point P to its initial speed \(v_0\) is :