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प्रश्न
One of the following gives the correct sequence of the components in a reflex arc. This is:
विकल्प
Receptors → Muscle → Sensory neuron → Motor neuron → Spinal cord
Receptors → Motor neuron → Spinal cord → Sensory neuron → Muscle
Receptors → Spinal cord → Sensory neuron → Motor neuron → Muscle
Receptors → Sensory neuron → Spinal cord → Motor neuron → Muscle
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उत्तर
Receptors → Sensory neuron → Spinal cord → Motor neuron → Muscle
Explanation:
The pathway taken by a nerve impulse in a reflex action is called reflex arc.
The correct sequence of the components in a reflex arc is given below:
Receptors → Sensory neuron → Spinal cord → Motor neuron → Muscle.
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संबंधित प्रश्न
Name two parts of the body which contain receptors of chemical stimuli.
Fill in the following blank with suitable word :
A neuron which carries an impulse to the brain is called a ........... neuron.
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 gland which is stimulated to secrete saliva.
Cerbellum, medulla and pons are the parts of :
(a) mid-brain
(b) hind-brain
(c) forebrain
(d) spinal cord
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.
Differentiate between the following pair of terms:
Stimulus and impulse
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
List in tabular form three distinguishing features between cerebrum and cerebellum.
Give one example of a conditioned reflex in your own life.
State whether the following is
Sneezing
State whether the following is simple reflex, conditioned reflex or neither of the two.
Blushing
State whether the following is
Playing on the Keyboard
Mention, if the following statement is True or False
A reflex action is a spontaneous response to a stimulus.
Complete the following sentence with appropriate Word
The control of reflex action is through:
Which of the following is an example of unconditioned reflex?
Why have reflex arcs evolved in animals?
Given alongside is a partial diagrammatic representation of a certain phenomenon pertaining to the nervous system.
 |
- 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.
