Non-dividing cells like heart cells, neuron are in ____ phase

Options

A. `G_(1)`
B. `G_(2)`
C. `G_(4)`
D. `G_(0)`

Answer

To answer the question regarding the phase in which non-dividing cells like heart cells and neurons are found, we can break down the information step by step:

### Step-by-Step Solution:

1. **Understanding the Cell Cycle**: The cell cycle consists of several phases: G1 (Gap 1), S (Synthesis), G2 (Gap 2), and M (Mitosis). Each phase has specific functions and processes.

2. **Identifying Non-Dividing Cells**: Non-dividing cells, such as heart cells and neurons, do not undergo the typical cell division process. Instead, they perform their specialized functions without entering the mitotic phase.

3. **G1 Phase**: The G1 phase is the first stage of interphase where the cell grows and prepares for DNA replication. However, cells that do not divide do not proceed to the S phase.

4. **G0 Phase**: After the G1 phase, some cells enter a resting or quiescent state known as the G0 phase. In this phase, cells are metabolically active but do not divide. This phase is crucial for cells that have differentiated and are no longer required to replicate.

5. **Conclusion**: Non-dividing cells like heart cells and neurons are primarily found in the G0 phase of the cell cycle, where they remain inactive until there is a specific need for them to re-enter the cell cycle.

### Final Answer:
Non-dividing cells like heart cells and neurons are in the **G0 phase**.

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