NCERT Class 11 Science — Chapter 8: Neural Control and Coordination

With reference to coordination in the human body, consider the following statements: 1. Neural pathways enable rapid point-to-point signalling. 2. Hormones provide electrical integration across organs. 3. Both systems jointly ensure synchronised organ function. Which of the statements given above are correct?

Consider the following statements about synapses: 1. Electrical synapses transmit faster than chemical synapses. 2. Chemical synapses have closely apposed membranes with no cleft. 3. Electrical synapses are rare in humans. Which of the statements given above are correct?

Assertion (A): Impulse transmission across an electrical synapse is very similar to impulse conduction along a single axon. Reason (R): At electrical synapses, the membranes of the pre- and post-synaptic neurons are in very close proximity, allowing current to flow directly.

Consider the following statements: 1. The cerebral cortex contains only motor areas. 2. Association areas are responsible for intersensory associations, memory and communication. 3. Sensory areas are present in the cortex. Which of the statements given above are correct?

Assertion (A): In a resting neuron, the axonal membrane is positively charged outside and negatively charged inside. Reason (R): The sodium-potassium pump transports 3 Na+ into the cell for every 2 K+ transported out.