In animal cells centrioles are located in, and form part of, the centrosome where they are paired structures lying at right angles to one another. In this context they are possibly involved in spindle assembly during mitosis. The centrosome is positioned in the cytoplasm outside the nucleus but often near to it.
Answer:
(a) Muscle B contracts and muscle A relaxes
(b) The Heart
False like blood lymph won't flow both to and from the heart
