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प्रश्न
Fill in the following blank with suitable word :
A neuron which carries an impulse to the brain is called a ........... neuron.
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उत्तर
A neuron which carries an impulse to the brain is called a sensory neuron.
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संबंधित प्रश्न
How do we detect the smell of an agarbatti (incense stick)?
Which part of the eye contains cells which are sensitive to light?
Give three examples of reflex actions.
Fill in the following blanks with suitable words :
Our.............system allows us to react to our surroundings. Information from receptors passes along...........neurons to our brain. Our brain sends impulses along..........neurons to our muscles.
What are the various sense organs in our body?
Name the function of cerebrum.
Explain the difference between of the following pair of terms :
receptor and effector
Define reflex arc. Give the flow chart of a spinal reflex arc.
When we touch a hot plate unknowingly, then this heat is sensed by a receptor P present in our fingers. The receptor triggers and impulse in neuron Q which transmits the message to an organ R which is a part of the central nervous system. Here the impulse is passed on to a neuron S which in turn passes it to a yet another neuron T. The neuron T passes the impulse to a tissue U in our arm. The tissue U then contracts and pulls our hand away from the hot plate.
(a) What is the name of (i) receptor P (ii) neuron Q, and (iii) organ R?
(b) What is (i) neuron S, and (ii) neuron T?
(c) Name the tissue U.
(d) What name is given to the phenomenon in which hand is pulled away quickly from the hot plate?
(e) Name the effector in this whole process.
State whether the following is
Sneezing
State whether the following is simple reflex, conditioned reflex or neither of the two.
Lifting up a book
State whether the following is
Playing on the Keyboard
What type of reflex is the following?
Solving mathematical sums
In reflex action, the reflex arc is formed by ______
A change in the environment that causes an animal to react is called ______.
Reflex actions are mediated through ____________.
How is the mode of action in beating of the heart different from reflex actions? Give four examples.
Why have reflex arcs evolved in animals?
Categorise the following under stimulus and response.
Pain in the eye if something falls into it.
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.
