Answer:
Self-antigens are not recognized and attacked by the T cells.
Explanation:
In immunology, the antigens are those substances which are bound by the antibodies. The antigens can be originated from within the bodies, known as self antigens or from outside the body, known as non-self antigens. The immune system identifies and attacks non-self invaders or the foreign harmful objects present in the body. It does not attack the self-antigens under the normal conditions. This is due to the negative selection of T cells of the thymus.
Answer:
Actin filaments return to their original positions (does not occur in muscle contraction, according to the sliding filament model).
Explanation:
Answer:
C. how natural processes can introduce harmful materials into the environment
Explanation:
<span>https://www.ptable.com/
b. Boron and Carbon
and here's a periodic table to help you
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<span>Multicellular organisms carry out the process of specialization of cells which is the process where cells are required to be more specialized to perform functions in living beings such as; nutrition and for that, you need more cells. These organisms must regenerate the entire organism from germ cells.</span>
