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Question
How is the mode of action in beating of the heart different from reflex actions? Give four examples.
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Solution
| 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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RELATED QUESTIONS
How are involuntary actions and reflex actions different from each other?
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?
Which of the following helps in maintaining posture and balance of the human body?
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?
With the help of suitable example, describe reflex action.
Multiple choice question. Tick (✓) the correct choice:
Reflex actions occur under the control of
- brain
- medulla oblongata
- spinal cord
- cerebrum
State whether the following is simple reflex, conditioned reflex or neither of the two:
Knitting without looking: …………………..
What type of reflex is the following?
Formation of goose-pimples in cold weather.
Give Reason:
The hand automatically shows the direction to turn a cycle without thinking.
