Question

Возьмите карандаш. Проведите тупой его частью по коже тыльной стороны кисти. Что вы заметили? Продолжайте наблюдать.Что произошло с цветом кожи? Можно ли эти изменения объяснить, используя знания о вегетативной нервной системе?Предложите свою версию, объясняющую изменения цвета кожи.

Answer 1

После того, как провели - кожа стала белой, Чуть позже она покраснела. Покраснение кожи - это ответ на раздражитель (карандаш)

Answer 2

Observations and Explanations of Skin Color Changes

When you take a pencil and rub the blunt end against the skin on the back of your hand, you may notice some changes in the color of your skin. Let's explore what these changes might be and how they can be explained using knowledge of the autonomic nervous system.

Observations: - After rubbing the blunt end of the pencil on the skin, you may notice a temporary whitening or blanching of the skin in the area where the pencil was applied. - As you continue to observe, you may notice that the skin gradually returns to its normal color, or you may observe a reddening or flushing of the skin in the area.

Explanation: These changes in skin color can be explained by the functioning of the autonomic nervous system, which controls involuntary bodily functions, including the regulation of blood vessels in the skin.

When the blunt end of the pencil is rubbed against the skin, it stimulates the nerve endings in the area. This stimulation triggers a response from the autonomic nervous system, specifically the sympathetic division, which is responsible for the "fight or flight" response.

The sympathetic division of the autonomic nervous system causes vasoconstriction, which is the narrowing of blood vessels in the skin. This vasoconstriction reduces blood flow to the area, leading to the temporary whitening or blanching of the skin. The reduced blood flow is a result of the sympathetic nervous system's attempt to redirect blood to more vital organs and muscles during a perceived threat or stress.

After some time, the parasympathetic division of the autonomic nervous system, which is responsible for the "rest and digest" response, counteracts the sympathetic response. The parasympathetic division causes vasodilation, which is the widening of blood vessels in the skin. This vasodilation increases blood flow to the area, resulting in the reddening or flushing of the skin as the blood vessels expand and more blood reaches the surface.

These changes in skin color are part of the body's natural response to stress or stimulation and are regulated by the autonomic nervous system.

Please note that the information provided here is based on general knowledge of the autonomic nervous system and its effects on the skin. For more specific or medical-related information, it is always best to consult a healthcare professional.