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प्रश्न
What is meant by receptors and effectors? Give two examples of each.
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उत्तर
A receptor is a cell present in the sense organs that is sensitive to specific stimuli. Example: The eyes have light receptors which can detect light and the ears have sound receptors which can detect sound.
An effector is a part of body which can respond to a stimulus according to the instructions given from the nervous system.
Example: Muscles and glands of the human body.
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संबंधित प्रश्न
Which of the following is not a natural reflex action?
A. Knee-jerk
B. Blinking of eyes due to strong light
C. Salivation at the sight of food
D. Sneezing when any irritant enters the nose
Name one gustatory receptor and one olfactory receptor present in human beings.
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.
Name two parts of the body which contain receptors of chemical stimuli.
Explain the difference between of the following pair of terms :
cerebrum and cerebellum
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?
Define reflex arc. Give the flow chart of a spinal reflex arc.
Which of the following helps in maintaining posture and balance of the human body?
One of the following controls the peristaltic movements of alimentary canal. This one is :
(a) cerebrum
(b) cerebellum
(c) pons
(d) medulla
List in tabular form two differences between reflex action and walking.
List in tabular form three distinguishing features between cerebrum and cerebellum.
State whether the following is
Playing on the Keyboard
What type of reflex is the following?
Blinking of the eye
Give Technical Term:
Response to a stimulus without the intervention of the will of an animal.
Give an example for conditioned reflexes.
Reflex actions are mediated through ____________.
Which of the following is not an involuntary action?
Categorise the following under stimulus and response.
Seeing a green light turning into red at a road crossing before applying the brakes.
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.
