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प्रश्न
Which of the following is not an involuntary action?
विकल्प
Vomiting
Salivation
Heart beat
Chewing
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उत्तर
Chewing
Explanation -
Involuntary action is the actions which are happening "without" the conscious choice of the organism. So chewing which is under conscious control is a voluntary action.
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संबंधित प्रश्न
With the help of a neat and labelled diagram, describe reflex arc.
Briefly explain the following terms : Reflex action
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.
What is meant by receptors and effectors? Give two examples of each.
Give the functions of medulla.
Explain the difference between of the following pair of terms :
cerebrum and cerebellum
What is the difference between a voluntary and an involuntary action? Which kind of action is digestion? Explain your choice.
Which of the following are cerebral reflexes?
(i) a person pulls away his hand on touching a hot object
(ii) a person spits out immediately when a fly enters his mouth while talking
(iii) A person walking bare foot lifts his foot at once on stepping on to a nail
(iv) A person's pupil contracts at once in the presence of bright light
(a) (i) and (ii) (b) (ii) and (iii) (c) (iii) and (iv) (d) (ii) and (iv)
Write down the following activities in the correct order for a simple reflex arc:
(a) impulse travels in the motor fibre
(b) impulse travels in the sensory fibre
(c) effector organ stimulated
(d) impulse crosses the synapse
With the help of suitable example, describe reflex action.
State whether the following is simple reflex, conditioned reflex or neither of the two:
Blushing: ……………….
List in tabular form two differences between reflex action and walking.
Explain the following term :
Conditioned reflex
State whether the following is
Blinking
What type of reflex is the following?
Solving mathematical sums
Give Technical Term:
The scientist, who conducted experiment on a dog to show conditioned reflex
Which one of the following is not a simple reflex?
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.
