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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
Which part of the eye contains cells which are sensitive to light?
Cerbellum, medulla and pons are the parts of :
(a) mid-brain
(b) hind-brain
(c) forebrain
(d) spinal cord
All the voluntary actions of our body are controlled by :
(a) cerebrum
(b) cerebellum
(c) pons
(d) medulla
Which of the following statements are true?
(i) sudden action in response to something in the environment is called reflex action
(ii) sensory neurons carry electrical signals from spinal cord to muscles in a reflex action
(iii) motor neurons carry signals from receptors to spinal cord in a reflex action
(iv) the pathway of transmitting signals from a receptor to a muscle is a reflex action
A cylindrical structure P in our body begins in continuation with medulla and extends downwards. It is enclosed in a bony cage Q and surrounded by membranes R. As many as x pairs of nerves arise from the structure P. The structure P is involved in the reflex actions of our body and conduction of nerve impulses to and from another organ S of our body with which it forms CNS.
(a) Name the structure P.
(b) Name (i) bony cage Q, and (ii) membranes R.
(c) How much is x?
(d) Name the organs S.
(e) What are the reflexes involving structure P only known as?
Reflex action is controlled by the
State whether the following is
Salivation when food is put in the mouth.
Complete the following sentence with appropriate Word
Which of the following is not a natural reflex action?
Categorise the following under stimulus and response.
Seeing a green light turning into red at a road crossing before applying the brakes.
State whether the following is simple reflex, conditioned reflex or neither of the two.
Sneezing
