the term used to describe how well an organism functions in its environment is variation
A Lipid because it's a fresh osmosis they are always active
Answer:
Helper T cells stimulate B-cells to produce antibodies and killer T cells to destroy the non-self cells. Cytotoxic T cells on the other hand are direct attack cells. They can kill the micro organisms by creating pores on the invader's cell.
Explanation:
T lymphocyte mediated immunity of cell mediated immunity do not secrete antibodies but they help stimulate the B cells to produce them. Immature T cells are produced in bone marrow from where they migrate to thymus via blood. In the thymus maturation of T cells occur and then they migrate to lymphoid tissue and get differentiated into three types:
a. Helper T cells: As the name suggests, they help in activating other immune cells, in other terms they are the regulator of virtually all functions of immune system. Protein mediator called lymphokines are produced by these helper T cells in order to regulate the immune functions. Some examples of these lymphokines are: Interleukin-2 interleukin-3, interferon gamma. T helper cells stimulate the B-cells to produce antibodies.
b. Cytotoxic cells or killer T cells: The lymphokine interleukin-2 is responsible for the growth and proliferation of both cytotoxic T cells and suppressor T cells. With the help of receptor proteins on the surface of killer T cells, they bind to the specific antigen. After binding, they secrete a pore forming protein called perforins which create pores on the invaders cell membrane for water to enter into it thereby cell swells and finally lyse.
c. Suppressor T cells: They suppress the function of above two T cells.
<span>The appropriate response to the question is parenchyma. The parenchyma is the utilitarian parts of an organ in the body. This is as opposed to the stroma, which alludes to the basic tissue of organs, specifically, the connective tissues. It is a functional part of animal's body. </span>
Answer:The mass of a liquid can be measured using one of these two methods: Method n 1: - Measure the mass of the empty container. - Pour the liquid into the container and measure the new mass. - The mass of liquid is obtained by subtracting the mass of the container to the total mass. hope this makes sense :)
Explanation:
