Question

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Answer 1

Answer:

1 The basic unit of the nervous system is a nerve cell, or neuron. The human brain contains about 100 billions neuron.

2 the electrical impulse from one neuron moves to the other neuron through a junction between them called synapse. in this way the electrical impulse is carried from the brain to the body parts. Neuron convey messages to the brain by converting them to electrical impulse

3. central nervous system

The central nervous system (CNS) is the part of the nervous system consisting primarily of the brain and spinal cord.

4. The nervous system has two main parts: The central nervous system is made up of the brain and spinal cord. The peripheral nervous system is made up of nerves that branch off from the spinal cord and extend to all parts of the body.

5. The reflex actions which are rapid responsea or movements to the stimulus are controlled by the SPINAL CORD and not by the brain or muscles.

6. The endocrine system is a chemical messenger system comprising feedback loops of the hormones released by internal glands of an organism directly into the circulatory system, regulating distant target organs. In humans, the major endocrine glands are the thyroid gland and the adrenal glands.

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Answer 2

1.The basic unit of the nervous system is a nerve cell, or neuron. The human brain contains about 100 billion neurons.

2.the electrical impulse from one neuron moves to the other neuron through a junction between them called synapse. in this way the electrical impulse is carried from the brain to the body parts. Neuron convey messages to the brain by converting them to electrical impulse

3.central nervous system

The central nervous system (CNS) is the part of the nervous system consisting primarily of the brain and spinal cord.

4.The nervous system has two main parts: The central nervous system is made up of the brain and spinal cord. The peripheral nervous system is made up of nerves that branch off from the spinal cord and extend to all parts of the body

5.In a reflex action, the spinal cord along with the brain stem is responsible for the reflex movements. A few examples of reflex action are: When light acts as a stimulus, the pupil of the eye changes in size.

6.Endocrine glands are ductless glands of the endocrine system that secrete their products, hormones, directly into the blood. The major glands of the endocrine system include the pineal gland, pituitary gland, pancreas, ovaries, testes, thyroid gland, parathyroid gland, hypothalamus and adrenal glands.