Vision improves under stress – What happens to the organism when the brain detects danger

When we face a stressful situation, our brain recognizes it as danger, putting the whole organism on alert.

The bloodflow to the muscles increases, the senses sharpen, the pain threshold rises and we often get goosebumps as well. The central nervous system raises the pain threshold so that we can more easily handle the stress and potential injuries.

The pupils dilate, allowing the eyes to take in a larger number of photons, improving the vision, even in minimal lighting.

Liver sugar, in the form of glycogen supplies, turns into glucose, the main source of energy, immediately available to the organism.

The heart rate increases, allowing for increased inflow of blood and oxygen to the muscles. Thanks to this, muscles get more glucose than otherwise.

Adrenal glands produce larger amounts of the stress hormone – adrenaline, which makes for quicker reflexes and improves thinking and decision-making.

The inflow of blood to the intestines reduces, and the blood is redirected to the brain and the muscles.

stress

stress induced changes to the organism

impact of stress on the organism