73. Which of the following is an organelle found in a human muscle cell?
Answer: B
Mitochondrion is an organelle found in a human muscle cell.
Mitochondria are essential organelles in human muscle cells, responsible for producing energy through aerobic respiration. They play a crucial role in meeting the high energy demands of muscle activity.
A) Cell wall
The cell wall is a rigid structure found in plant cells, bacteria, and fungi, but it is absent in animal cells, including human muscle cells. Therefore, it cannot be considered an organelle in this context.
B) Mitochondrion
Mitochondria are often referred to as the powerhouses of the cell, generating adenosine triphosphate (ATP), which is vital for muscle contraction and overall cell function. This makes mitochondria a key organelle in human muscle cells.
C) DNA
While DNA is present in all cells, including muscle cells, it is not classified as an organelle. Instead, DNA resides in the nucleus and is responsible for genetic information, not energy production or cellular metabolism.
D) Retina
The retina is a layer of tissue at the back of the eye responsible for vision, and it is not an organelle found in muscle cells. Therefore, it does not relate to the cellular structure of human muscle tissue.
Conclusion
Mitochondria are the only option listed that serve as organelles in human muscle cells, directly contributing to energy production necessary for muscle function. The other options fail to meet the criteria of being organelles found specifically in muscle cells, making the choice of mitochondrion definitive.