Some muscle cells contain several nuclei per cell. Which of the following provides the most likely explanation for the way in which these cells came to have more than one nucleus? A B с D They underwent repeated mitosis simultaneously with cytokinesis. They underwent repeated mitosis but not cytokinesis. They underwent multiple S phases before entering mitosis. They underwent repeated cytokinesis but not mitosis.
Some muscle cells contain several nuclei per cell. Which of the following provides the most likely explanation for the way in which these cells came to have more than one nucleus? A B с D They underwent repeated mitosis simultaneously with cytokinesis. They underwent repeated mitosis but not cytokinesis. They underwent multiple S phases before entering mitosis. They underwent repeated cytokinesis but not mitosis.
Human Anatomy & Physiology (11th Edition)
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Question
Transcribed Image Text:**Question:**
Some muscle cells contain several nuclei per cell. Which of the following provides the most likely explanation for the way in which these cells came to have more than one nucleus?
**Options:**
- **A**: They underwent repeated mitosis simultaneously with cytokinesis.
- **B**: They underwent repeated mitosis but not cytokinesis.
- **C**: They underwent multiple S phases before entering mitosis.
- **D**: They underwent repeated cytokinesis but not mitosis.
**Explanation:**
This multiple-choice question examines the understanding of cell division processes in muscle cells that result in multinucleation. Muscle cells, such as skeletal muscle fibers, often have multiple nuclei because they undergo repeated cell cycles without cytokinesis—cell division that involves mitosis without the subsequent splitting of the cytoplasm. Therefore, the correct explanation for the multinucleation could be found by understanding these cellular processes:
- **Mitosis**: The process where a single cell divides to produce two identical daughter cells.
- **Cytokinesis**: The process where the cytoplasm of a parental cell is divided into two daughter cells.
**Correct Answer: B. They underwent repeated mitosis but not cytokinesis.**
This results in a single cell with multiple nuclei since the nuclear material duplicates and divides, but the cell itself does not split into separate cells.
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