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.
Small lymphocytes 7â8 Large lymphocytes 12â15. 1  B cells: releases antibodies and assists activation of T cells. 2  T cells: CD4+ Th (T helper) cells: activate and regulate T and B cells. CD8+ cytotoxic T cells: virus-infected and tumor cells. 3  Natural killer cells: virus-infected and tumor cells.