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प्रश्न
Which of the following cannot be considered a receptor?
(a) ear
(b) nose
(c) muscle
(d) eye
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उत्तर
(c) Muscle
Sense organs contain receptors. The ear, nose and eye are sense organs, a muscle is not.
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संबंधित प्रश्न
Name two parts of the body which contain receptors of chemical stimuli.
Which part of the eye contains cells which are sensitive to light?
What is spinal cord? What is its main function?
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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.
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(d) Name nerves S.
(e) How do messages travel through the nerves Q and S?
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Stimulus and impulse
Note the relationship between the first two words and suggest the suitable word/words for the fourth place.
Stimulus : Receptor :: Impulse : ______.
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Sudden application of brakes of the cycle on sighting an obstacle in front
What is the difference between reflex action and voluntary action?
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Reflex action
What type of reflex is the following?
Knitting and swimming
Mention, if the following statement is True or False
A reflex action is a spontaneous response to a stimulus.
Complete the following sentence with appropriate Word
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A change in the environment that causes an animal to react is called ______.
Reflex actions are mediated through ____________.
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Identify the parts labeled as A to E and select the correct option.
What kind of reflex is cycling?
The diagram given below shows the internal structure of a spinal cord depicting a phenomenon. Study the diagram and answer the following questions.
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- Name the phenomenon shown in the figure and define the same.
- Identify the parts labelled as 1 and 2. Write one functional difference between these two.
- Name the bony protective covering and the membranous protective covering of the spinal cord.
- Label the guidelines 3 and 4.
- How is the labelled part 3 different from part 4 with respect to its composition (part of neuron)?
- Give the technical term for the point of contact between the two nerve cells.
- Name the fluid filled inside the central canal of spinal cord.
- Name the term used for a small gap between two neurons.
- Give one example of a neurotransmitter.
- Draw a neat diagram of a nerve cell and label the parts: Perikaryon, Node of Ranvier, Myelin sheath and Axon terminals.
