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प्रश्न
Compare the nervous system and the endocrine system.
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उत्तर
Nervous system
- Messages are sent through nerve fibers.
- It consists of brain, spinal cord, and nerves.
- No hormones are secreted. Messages are sent as impulses.
- Transmission of impulse is quick.
Endocrine system
- Messages are sent through blood in the form of hormones.
- It consists of endocrine glands.
- Hormones secreted by glands regulate the body activities.
- Transmission takes time.
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संबंधित प्रश्न
In a synapse, chemical signal is transmitted from :
(a) axon to cell body of the same neuron
(b) cell body to axon end of the same neuron
(c) dendrite end of one neuron to axon end of adjacent neuron
(d) axon end of one neuron to dendrite end of adjacent neuron
The organ A which is located inside the skull of our body is protected by a bony shell B. It is surrounded by three layers membranes C. The spaces between these layers are filled with a liquid D which protects organ A from mechanical shocks. Organ A in combination with another organ E makes up the central nervous system.
(a) What is organ A?
(b) What are B, C and D?
(c) Name the organ E.
(d) While walking barefoot, if we happen to step on a sharp piece of stone, we immediately lift our foot up. Which of the two organs: A or E, is directly involved in this action?
(e) If we step out from a darkened room into bright sunlight, we close our eyes for a moment. Which of the two organs: A or E, is directly involved in this action?
With the help of a suitable diagram describe the structure of a neuron.
State whether the following statement is true (T) or false (F):
There are 31 pairs of cranial nerves.
Name the following:
Thoracolumber region of spinal cord form.
Nervous and hormonal systems together perform the function of control and coordination in human beings. Justify this statement with the help of an example.
Draw well labeled diagram of a ‘Neuron’ and name the following parts:
(1) Node of Ranvier (2) Nissil granules (3) Cyton
Explain the Term: Voluntary-action
State the Function:
Acetylcholine
______ and ______ increases the surface area of cerebrum.
