Limitations of the use of electrical impulses:
• Electrical impulses cannot be transmitted over long distances efficiently as they tend to lose strength.
• Electrical impulses require a point-to-point connection between neurons, making the process slower and less efficient in coordinating responses involving multiple body parts.
List - I | List – II | ||
A. | Schwann cells | i. | Neurotransmitter |
B. | Synaptic knob | ii. | Cerebral cortex |
C. | Bipolar neurons | iii. | Myelin sheath |
D. | Multipolar neurons | iv. | Retina |
Assertion (A): The sum of the first fifteen terms of the AP $ 21, 18, 15, 12, \dots $ is zero.
Reason (R): The sum of the first $ n $ terms of an AP with first term $ a $ and common difference $ d $ is given by: $ S_n = \frac{n}{2} \left[ a + (n - 1) d \right]. $