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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 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.
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उत्तर
- Reflex action: It is an automatic/quick/immediate, involuntary action in the body brought about by a stimulus.
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- Sensory neuron: The neuron in the spinal cord receives nerve impulses via its axon/terminal ends, which connect to receptor cells.
- Motor neuron: It transmits impulses from the association neuron in the CNS to the effector organ (muscle or gland).
- The vertebral column protects the spinal cord, while the meninges (dura mater, arachnoid mater, and pia mater) offer membrane protection.
- Part 3: Gray Matter,
Part 4: White Matter - Gray matter is made up of cell bodies (cytons), dendrites, and neutron synapses. White matter is made up of axons that connect nerve cells in gray matter.
- Synapse
- Cerebrospinal Fluid
- Synapse
- Acetylcholine
संबंधित प्रश्न
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
The olfactory receptors in humans are located in :
(a) eyes
(b) tongue
(c) ears
(d) nose
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?
List in tabular form three distinguishing features between cerebrum and cerebellum.
Give Technical Term:
The scientist, who conducted experiment on a dog to show conditioned reflex
In reflex action, the reflex arc is formed by ______
Differentiate between Voluntary and involuntary actions.
The given diagrammatic representation of reflex action shows knee jerk reflex.
Identify the parts labeled as A to E and select the correct option.
If after cutting through dorsal root of a spinal nerve of a mammal, the associated receptor in skin was stimulated the animal would ______.
