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:
Gas
Explanation:
Liquids have a fixed volume but no fixed shape. Gases have no fixed volume and no fixed shape.
They have 46, instead of the usual 47.
Answer:
True
Explanation:
Change blindness happens when an observer fails to notice large changes of objects or to scenes following a brief visual disruption. That is, visual stimuli undergoes a change without the observer noticing it.
For this case, the man had change blindness .He did not notice the first construction worker he was giving direction to was replaced by a different person. This was after a brief interruption caused by two experimenters passing between them carrying a door.
