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.
There are four types of T cells, each with a special purpose. Helper T cells detect infection and get the other cells of the immune system ready for battle. Helper T cells also tell B cells to produce antibodies, highly specialized proteins that help defend the body against infection. Cytotoxic, or killer, T cells destroy infected cells. Regulatory T cells tell the immune system when the battle with the pathogens is over and to stop fighting. Memory T cells remember how to defeat an infection and can respond rapidly if the same infection reoccurs.