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प्रश्न
Explain the difference between of the following pair of terms :
receptor and effector
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उत्तर
| Receptor | Effector |
| A receptor is a cell (or a group of cells) present in a sense organ which is sensitive to a particular types of stimuli such as light, sound, smell, taste, heat and pressure. | An effector is a part of the body which can respond to a stimulus according to the instructions sent from the nervous system. |
| Eyes have light receptors; ears have sound receptors, etc. | Muscles and glands are examples of effectors. |
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संबंधित प्रश्न
Name one gustatory receptor and one olfactory receptor present in human beings.
Name two parts of the body which contain receptors of chemical stimuli.
State whether coughing is a voluntary action or reflex action.
Which of the following cannot be considered a receptor?
(a) ear
(b) nose
(c) muscle
(d) eye
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
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 simple reflex, conditioned reflex or neither of the two:
Sneezing: …………….
State whether the following is simple reflex, conditioned reflex or neither of the two.
Contraction of eye pupil
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
Explain the following term :
Conditioned reflex
State whether the following is simple reflex, conditioned reflex or neither of the two.
Lifting up a book
State whether the following is
Salivation when food is put in the mouth.
What type of reflex is the following?
Blinking of the eye
What will you do if someone pricks your hand with a needle? Elucidate the pathway of response with a neat labelled diagram.
The reflex arc which is made up of one sensory and one motor neuron is ______
Which of the following is not involved in Knee-jerk reflex?
What kind of reflex is cycling?
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.
 |
- 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.
