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प्रश्न
The involuntary actions in the body are controlled by :
(a) medulla in forebrain
(b)medulla in hindbrain
(c) medulla in spinal cord
(d) medulla in midbrain
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उत्तर
(b) medulla in the hindbrain
The medulla controls various involuntary actions such as heart beat, breathing, blood pressure and peristaltic movement in the body.
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संबंधित प्रश्न
Give examples of unconditional reflexes
If we happen to touch a hot object unknowingly, we immediately pull back our hand. What is this type of action known as?
State one function each of cerebellum and pons.
State whether coughing is a voluntary action or reflex action.
What are the various sense organs in our body?
Write the names of the regions in hindbrain. Give one function of each region.
Name the function of cerebrum.
When you smell a favourite food your mouth begins to water (that is, you secrete saliva). Write down what is the example of the smell of the food?
Give the various functions of brain.
The olfactory receptors in humans are located in :
(a) eyes
(b) tongue
(c) ears
(d) nose
Put a tick mark (✓) against the correct alternative in the following statement:
The smell of good food causes watering of your mouth. It is a
With the help of suitable example, describe reflex action.
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 simple reflex, conditioned reflex or neither of the two:
Blushing: ……………….
State whether the following is simple reflex, conditioned reflex or neither of the two.
Sudden application of brakes of the cycle on sighting an obstacle in front
State whether the following is simple reflex, conditioned reflex or neither of the two.
Blushing
Give Technical Term:
The scientist, who conducted experiment on a dog to show conditioned reflex
State whether the following is simple reflex, conditioned reflex or neither of the two.
Sneezing
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.
