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प्रश्न
Write the names of the regions in hindbrain. Give one function of each region.
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उत्तर
The hindbrain has three regions: the pons, the cerebellum and the medulla.
The pons take part in regulating the respiration.
The cerebellum helps in maintaining posture and balance of the body.
The medulla controls various involuntary actions such as the heart beat, breathing, blood pressure and peristaltic movements of the alimentary canal.
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संबंधित प्रश्न
How are involuntary actions and reflex actions different from each other?
With the help of a neat and labelled diagram, describe reflex arc.
Fill in the following blank with suitable word :
A neuron which carries an impulse to the brain is called a ........... neuron.
When you smell a favourite food your mouth begins to water (that is, you secrete saliva). Write down what is the example of the cells in your nasal passages which perceive the smell?
Which of the following cannot be considered a receptor?
(a) ear
(b) nose
(c) muscle
(d) eye
The gustatory receptors of our body are in one of the following organs. This organ is :
a) ear
(b) nose
(c) tongue
(d) skin
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.
Differentiate between natural reflex and conditioned reflex. Give examples to illustrate your answer.
what do we refer to in the nervous system when we say:
Natural and conditioned …………………
Give an example for conditioned reflexes.
Differentiate between Voluntary and involuntary actions.
Which of the following is an example of unconditioned reflex?
Which one of the following is not a simple reflex?
Which sensory organ is involved in vertigo (sensation of oneself or objects spinning around)?
How is the mode of action in beating of the heart different from reflex actions? Give four examples.
Categorise the following under stimulus and response.
Seeing a green light turning into red at a road crossing before applying the brakes.
Given alongside is a partial diagrammatic representation of a certain phenomenon pertaining to the nervous system.
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- Name the parts numbered 1-7.
- Name the phenomenon that the diagram depicts and define it.
- Give the technical term for the point of contact between two nerve cells.
- Name the parts not shown in the diagram that should be included to complete the pathway of the phenomenon.
State whether the following is simple reflex, conditioned reflex or neither of the two.
Sneezing
