You can start with a bent-knee plank if you canât perform a regular plank yet. If you can hold a plank for more than two minutes with ease, you can move on to these tougher variations. Practise every day. Space your planking exercise throughout the day and do 3-4 times every day.
The interaction between helper T cells and B cell. sequentially involves antigen presentation by B cells to differentiated T cells, activation of helper T cells and. expression of membrane and secreted molecules by the helper T cells that bind to and activate the B cells.
T cells function both through the release of substances into the blood, and by signalling B cells through contact. 1  They have several different roles: 2  Signalling for growth and activation of B cells. 3  Activation of cells that can âeatâ foreign substances. 4  Stimulation of cytotoxic T cells during a viral infection.