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Then she heard it again. A soft scuff.

She took one step. Then another.

She stood up slowly. Her legs felt wobbly, not because she was scared, but because her brain was missing its usual cheat sheet. Deep inside her muscles and tendons, tiny receptors——were firing off frantic signals. Left knee is bent at 110 degrees. Right ankle is stable. The quadriceps are tensing. biologija 8 2 del resitve

A wave of dizziness hit her. She felt like she was tilting to the left. But she wasn’t.

She was sitting in the middle of the school’s pitch-black auditorium. Around her, 30 classmates were silent. Their biology teacher, Mr. Kovač, had given them a challenge: “Turn off your sight. Find the way out using only the tools your body hides inside.” Then she heard it again

Finally, her outstretched hand touched wood. The door.

For the first time in ten minutes, Lena felt normal. Then another

She pushed it open. The hallway was empty, lit by a dim emergency light. She blinked. Her pupils constricted violently. Her —specifically the cones, which handle bright light and color—flooded her brain with signals.

Her heart rate spiked. The kicked in—the part of the nervous system you can’t control. Her pupils dilated (though there was no light to take in), her palms sweated, and her liver released a burst of glucose into her blood for instant energy.