Question

Укажите, какие из перечисленных ниже явлений можно отнести к рефлексам. Движение растения к свету (раздражитель – свет; ответная реакция – поворот стебля в освещенную сторону) Отдергивание руки от огня Сокращение изолированной мышцы в ответ на раздражение подходящего к ней нерва электрическим током. Мигание глаз при резком неожиданном звуке.

Answer 1

Ответ:

Отдергивание руки от огня

Сокращение изолированной мышцы в ответ на раздражение подходящего к ней нерва электрическим током

Мигание глаз при резком неожиданном звуке.

Answer 2

Ответ:

Я думаю это мигание глаз при резком неожиданно звуке

Answer 3

Reflexes and their Classification

Reflexes are involuntary responses to specific stimuli that occur without conscious thought. They are automatic and rapid, serving to protect the body and maintain homeostasis. Reflexes can be classified into different types based on their characteristics.

Reflex Phenomena

Let's analyze the phenomena mentioned and determine which ones can be classified as reflexes:

1. Movement of a plant towards light: This phenomenon is known as phototropism, where plants respond to light by bending or growing towards it. It is a form of tropism, which is a growth or movement response to an external stimulus. In this case, the stimulus is light, and the response is the movement of the plant towards the light source. While this is a biological response, it is not considered a reflex in the same sense as the other examples mentioned.

2. Withdrawing the hand from fire: This is an example of a reflex known as the withdrawal reflex. When the hand comes into contact with a painful stimulus, such as fire, the sensory receptors in the skin send a signal to the spinal cord. The spinal cord then sends a signal to the muscles in the arm, causing them to contract and withdraw the hand from the source of heat. This reflex is an automatic protective response that helps prevent injury.

3. Contraction of an isolated muscle in response to electrical stimulation: This phenomenon is an example of a reflex called the muscle stretch reflex. When a muscle is stretched, specialized sensory receptors called muscle spindles detect the change in muscle length and send signals to the spinal cord. The spinal cord then sends signals back to the muscle, causing it to contract. This reflex helps maintain muscle tone and prevent overstretching or injury.

4. Blinking in response to a sudden loud sound: This is an example of a reflex known as the acoustic startle reflex. When a loud sound is detected by the auditory system, it triggers a reflexive response that causes the eyelids to close rapidly. This reflex helps protect the eyes from potential harm caused by sudden loud noises.

Based on the analysis above, the phenomena that can be classified as reflexes are:

- Withdrawing the hand from fire (withdrawal reflex) - Contraction of an isolated muscle in response to electrical stimulation (muscle stretch reflex) - Blinking in response to a sudden loud sound (acoustic startle reflex)

Please let me know if you found this information helpful or if you have any further questions!