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प्रश्न
How is the mode of action in beating of the heart different from reflex actions? Give four examples.
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उत्तर
| beating of heart | reflex actions |
| Involuntary actions are the actions which are not controlled by our will. |
Reflex actions are the sudden action in response to something. |
| They do not need any kind of stimulus to work. |
They required stimulus for its action. |
| These actions are regulated by the brain. | These actions are regulated by the spinal cord. |
| They do not involve skeletal muscle. | They do involve skeletal muscle. |
|
These actions are performed |
These actions are produced in |
| This action may be quick or slow. | Reflex actions are always quick. |
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संबंधित प्रश्न
What are the various sense organs in our body?
When you smell a favourite food your mouth begins to water (that is, you secrete saliva). Write down what is the example of the cells in your nasal passages which perceive the smell?
Give the various functions of brain.
P is a cell (or group of cells) in the human body which is sensitive to a particular type of stimulus and conveys the messages to CNS through nerves Q. On the other hand, R is a part of the human body which can respond to a stimulus according to the instructions sent from the CNS through nerves S.
(a) What is P? Name five organs which contain cells (or group of cells) like P.
(b) Name the nerves Q.
(c) What is R? Give two examples of R.
(d) Name nerves S.
(e) How do messages travel through the nerves Q and S?
Multiple choice question. Tick (✓) the correct choice:
Reflex actions occur under the control of
- brain
- medulla oblongata
- spinal cord
- cerebrum
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Lifting up a book: …………………..
State whether the following is simple reflex, conditioned reflex or neither of the two:
Knitting without looking: …………………..
Complete the following sentence with appropriate Word
A reflex arc in man is best described as movement of stimuli from:
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