Chapter 10: Neural Control and Coordination — Online MCQ Test
ZOOLOGY · CLASS 11th · Tamil Nadu State Board
Practice Chapter 10: Neural Control and Coordination with a free chapter-wise online MCQ test.
This chapter covers: Focusing on neural regulation this chapter details neuron structure nerve impulse generation conduction and central peripheral nervous systems. Students explore brain anatomy refle....
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Chapter 10: Neural Control and Coordination — Important Questions & Answers
Which part of the neuron is primarily responsible for receiving nerve impulses from other neurons?
- A. Axon
- B. Dendrites
- C. Myelin sheath
- D. Synaptic knob
Answer: B. Dendrites
Dendrites are branched extensions of the neuron that receive incoming chemical signals or impulses from other neurons.
Dendrites are branched extensions of the neuron that receive incoming chemical signals or impulses from other neurons.
The resting membrane potential of a neuron is maintained primarily by the movement of which ions?
- A. Sodium and Potassium
- B. Calcium and Magnesium
- C. Chloride and Bicarbonate
- D. Sodium and Chloride
Answer: A. Sodium and Potassium
The Sodium-Potassium pump actively transports 3 Na+ out and 2 K+ in, creating an electrical gradient essential for the resting potential.
The Sodium-Potassium pump actively transports 3 Na+ out and 2 K+ in, creating an electrical gradient essential for the resting potential.
During the depolarization phase of an action potential, which event occurs?
- A. Potassium channels open, and K+ ions leave the cell.
- B. Sodium channels open, and Na+ ions rush into the cell.
- C. Sodium channels close, and K+ ions rush into the cell.
- D. The sodium-potassium pump stops working entirely.
Answer: B. Sodium channels open, and Na+ ions rush into the cell.
Depolarization is caused by the rapid influx of Na+ ions into the neuron through voltage-gated sodium channels.
Depolarization is caused by the rapid influx of Na+ ions into the neuron through voltage-gated sodium channels.
If a person has a damaged cerebellum, which of the following activities would be most significantly affected?
- A. Recall of memory
- B. Maintenance of blood pressure
- C. Smooth coordination of walking and motor skills
- D. Sensation of touch
Answer: C. Smooth coordination of walking and motor skills
The cerebellum is responsible for fine-tuning motor movements, balance, and coordination of voluntary activities.
The cerebellum is responsible for fine-tuning motor movements, balance, and coordination of voluntary activities.
During an action potential, if the sodium-potassium pump is blocked by a chemical toxin, what is the immediate effect on the neuron?
- A. The neuron will fire action potentials continuously.
- B. The membrane potential will remain depolarized and cannot return to resting state.
- C. The neuron will immediately become hyperpolarized.
- D. The neuron will not be able to generate any action potentials after the first one.
Answer: D. The neuron will not be able to generate any action potentials after the first one.
Without the pump, the concentration gradients for Na+ and K+ will eventually dissipate, rendering the neuron incapable of maintaining or generating action potentials.
Without the pump, the concentration gradients for Na+ and K+ will eventually dissipate, rendering the neuron incapable of maintaining or generating action potentials.