Answer:
Mitochondria
Explanation:
Mitochondria are the organelles that will be found in active cells like muscles cells because these cells required a lot of energy and uses alot of energy and mitochondria is an organelle that help to generate energy from food. Hence, it is called Powe house because it generate energy for these cells activities.
Muscles cells contain hundreds or alot of mitochondria so as to generate energy for use.