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प्रश्न
What is spinal cord? What is its main function?
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उत्तर
The spinal cord is a part of the central nervous system. It is a cylindrical structure enclosed by a bony cage called the vertebral column. It is responsible for spinal reflex actions and the conduction of nerve impulses to and from the brain.
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संबंधित प्रश्न
State whether coughing is a voluntary action or reflex action.
What are the various sense organs in our body?
What is meant by receptors and effectors? Give two examples of each.
What is a reflex action? Explain with the help of an example.
A cell (or group of cells) in a sense organ which is sensitive to a particular type of stimulus is called :
(a) interceptor
(b) effector
(c) receptor
(d) acceptor
Which of the following cannot be considered a receptor?
(a) ear
(b) nose
(c) muscle
(d) eye
The part of brain which controls the involuntary action such as heart beat, breathing, blood pressure, etc. is :
(a) pons
(b) medulla
(c) cerebrum
(d) cerebellum
One of the following gives the correct sequence of the components in a reflex arc. This is:
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?
Your are driving your bicycle at a fast speed. Suddenly, a small boy comes in front of your cycle and, without wasting any time in thinking, you immediately apply the brakes and accident is avoided. What name is given to such an action?
Multiple choice question. Tick (✓) the correct choice:
Reflex actions occur under the control of
- brain
- medulla oblongata
- spinal cord
- cerebrum
Note the relationship between the first two words and suggest the suitable word/words for the fourth place.
Receptor : Sensory nerve :: Motor nerve : ______.
Two hungry boys (A and B) enter a restaurant and find a table decorated as follows:
Boy B starts salivating but not A. Explain the reason for this difference.
What is a reflex action?
State whether the following is simple reflex, conditioned reflex or neither of the two.
Lifting up a book
State whether the following is
Blinking
What type of reflex is the following?
Sweating in summer
The reflex arc which is made up of one sensory and one motor neuron is ______
Categorise the following under stimulus and response.
Seeing a green light turning into red at a road crossing before applying the brakes.
