Question

Нервная ткань обладает свойствами возбудимости, проводимости. Как в этом убедиться, не прибегая к помощи специальной аппарату-ры?​

Answer 1

Ответ: Эти свойства нервной ткани обусловлены особенностями строения клеток ткани-нейронов. У нейрона есть короткие ветвящиеся отростки-дендриты, окончания которых-рецепторы, способны воспринимать действие раздражителя и генерировать электрический импульс. Сигналы-импульсы способны перемещаться по мембранам нервных клеток. В основе прохождения нервного импульса лежат биоэлектрические явления, изменяющие разность потенциалов между внутренней и внешней поверхностями нервных клеток. У длинного отростка нейрона -аксона, есть миелиновая оболочка с перехватами Ранвье, по которой импульсы проводятся с максимальной скоростью. Между собой и другими клетками нейроны соединяются с помощью синапсов, в которых вырабатываются особые вещества-медиаторы, помогающие проводить импульсы от одной клетки к другой. В любой ткани особенности строения клеток обуславливают ее свойства и функции.

Объяснение:

Answer 2

Nervous Tissue and its Properties

Nervous tissue is a specialized type of tissue found in the nervous system. It is responsible for transmitting and processing information in the body. Nervous tissue possesses two important properties: excitability and conductivity.

Excitability refers to the ability of nervous tissue to respond to stimuli. When a stimulus is detected, such as a change in temperature or pressure, the nervous tissue can generate an electrical signal called an action potential. This electrical signal allows the nervous tissue to communicate and transmit information throughout the body.

Conductivity is the ability of nervous tissue to transmit the electrical signals generated. Nervous tissue contains specialized cells called neurons that are responsible for transmitting these signals. Neurons have long, thin extensions called axons that can carry the electrical signals over long distances within the body.

Verifying the Properties of Nervous Tissue

To verify the properties of nervous tissue, you can perform simple observations and experiments without the need for specialized equipment. Here are a few ways to do so:

1. Stimulus Response: Apply a stimulus to a part of your body and observe the response. For example, you can touch a hot object and observe how quickly you withdraw your hand. This quick withdrawal is a result of the excitability and conductivity of the nervous tissue in your body, which allows for rapid transmission of the signal from the sensory receptors to the muscles.

2. Reflex Arc: Observe a reflex arc, which is an involuntary response to a stimulus. For example, when you touch a hot surface, your hand automatically pulls away without conscious thought. This reflex action is mediated by the nervous tissue, which quickly transmits the signal from the sensory receptors to the muscles, bypassing conscious processing.

3. Observing Nerve Injuries: In cases of nerve injuries, such as a pinched nerve or carpal tunnel syndrome, you may experience symptoms like numbness, tingling, or weakness in specific areas of the body. These symptoms can be indicative of disruptions in the excitability and conductivity of the nervous tissue.

While these methods provide a basic understanding of the properties of nervous tissue, it's important to note that a comprehensive evaluation of nervous tissue often requires specialized equipment and techniques used in medical and scientific research.

I hope this information helps! Let me know if you have any further questions.