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प्रश्न
The diagram given below shows the internal structure of a spinal cord depicting a phenomenon. Study the diagram and answer the questions:
1) Name the phenomenon that is depicted in the diagram. Define the phenomenon.
2) Give the technical term for the point of contact between the two nerve cells.
3) Name the parts numbered 1, 2 and 3.
4) How does the arrangement of neurons in the spinal cord differ from that of the brain?
5) Mention two ways by which the spinal cord is protected in our body.
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उत्तर
1) Reflex action
Definition - A quick, automatic, involuntary and often unconscious action brought about when the
receptors are stimulated by external or internal stimuli.
2) Synaptic - Junction
3)
- 1 = Sensory neuron
- 2 = Motor neuron
- 3 = Grey matter with the central canal of the spinal cord
4) The grey matter is present in the cortex (outer side) consisting of cell bodies and white matter is present inside, which consists of myelinated axons in the brain.
In the spinal cord, the grey matter (cell bodies) are present inside, while white matter (Myelinated axon) is present outside.
5) The vertebral column, meninges and cerebrospinal fluid (CSF).
APPEARS IN
संबंधित प्रश्न
Name one gustatory receptor and one olfactory receptor present in human beings.
Give three examples of reflex actions.
Differentiate between natural reflex and conditioned reflex. Give examples to illustrate your answer.
Note the relationship between the first two words and suggest the suitable word/words for the fourth place.
Stimulus : Receptor :: Impulse : ______.
State whether the following is
Cleaning
What type of reflex is the following?
Knitting and swimming
What type of reflex is the following?
Blinking of the eye
Give Technical Term:
The scientist, who conducted experiment on a dog to show conditioned reflex
Reflex actions are mediated through ____________.
The diagram given below shows the internal structure of a spinal cord depicting a phenomenon. Study the diagram and answer the following questions.
 |
- 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.
