Name a few exchange pumps a cell membrane has.

Explanation

**Step-by-Step Solution:**

1. **Understanding Exchange Pumps**: Exchange pumps are specialized proteins located in the cell membrane that facilitate the movement of ions and molecules across the membrane. They are crucial for maintaining cellular homeostasis.

2. **Calcium Pump**: The first type of exchange pump is the calcium pump. This pump is responsible for transporting calcium ions (Ca²⁺) out of the cell or into the sarcoplasmic reticulum in muscle cells. This process helps regulate calcium levels in the blood and is vital for various cellular functions.

3. **Potassium-Sodium Pump**: The second type is the sodium-potassium pump (Na⁺/K⁺ pump). This pump actively transports sodium ions (Na⁺) out of the cell while bringing potassium ions (K⁺) into the cell. It plays a critical role in maintaining the electrochemical gradient across the cell membrane, which is essential for nerve impulse transmission and muscle contraction.

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