Numerical Problems/ICSE/Class 10
Created by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
Created by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
Numerical Problems - Control and Coordination
If the nerve impulse travels at an average speed of 100 meters per second (m/s) and a reflex arc involves a total neural pathway length of 0.5 meters, how long (in milliseconds) would it take for the reflex action to occur?
Solution:
Time = Distance / Speed
Distance = 0.5 meters Speed = 100 meters/second
Time = 0.5 m / 100 m/s = 0.005 seconds
To convert seconds to milliseconds, multiply by 1000: Time in milliseconds = 0.005 s * 1000 ms/s = 5 milliseconds
Therefore, it would take approximately 5 milliseconds for the reflex action to occur.
A polysynaptic reflex involves an interneuron between the sensory neuron and the motor neuron. If a reflex arc has one sensory neuron, one interneuron, and one motor neuron, how many synapses are involved in this reflex pathway?
Solution:
Therefore, there are 2 synapses involved in this polysynaptic reflex pathway.
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