Important McQs related to neurons with answers?

1. What is the main function of a neuron?
Answer: The main function of a neuron is to transmit electrical and chemical signals throughout the body.

2. What is the basic structural unit of a neuron?
Answer: The basic structural unit of a neuron is the cell body, dendrites, and axon.

3. What is the role of dendrites in a neuron?
Answer: Dendrites receive signals from other neurons and transmit them to the cell body.

4. What is the role of the axon in a neuron?
Answer: The axon transmits signals away from the cell body to other neurons or muscles.

5. What is the myelin sheath and what is its function?
Answer: The myelin sheath is a fatty substance that surrounds and insulates the axon, speeding up the transmission of electrical signals.

6. What is the synapse?
Answer: The synapse is the junction between two neurons where signals are transmitted from one neuron to another.

7. What are neurotransmitters and what is their role in neuron communication?
Answer: Neurotransmitters are chemical messengers that transmit signals across the synapse from one neuron to another.

8. What is the resting membrane potential of a neuron?
Answer: The resting membrane potential of a neuron is approximately -70mV, meaning that the inside of the neuron is negatively charged compared to the outside.

9. What is an action potential?
Answer: An action potential is a rapid change in the membrane potential of a neuron that allows for the transmission of electrical signals along the axon.

10. What is synaptic plasticity?
Answer: Synaptic plasticity is the ability of synapses to strengthen or weaken over time, which is important for learning and memory.

Question 1: Which type of neuron transmits signals to other neurons?

(A) Sensory
(B) Motor
(C) Interneuron
(D) Bipolar

Answer: C

Question 2: What is the function of the myelin sheath in neurons?

(A) To conduct signals faster
(B) To provide insulation for the neuron
(C) To secrete neurotransmitters
(D) To receive signals from other neurons

Answer: B

Question 3: Which part of the neuron contains the nucleus?

(A) Axon
(B) Dendrite
(C) Cell body
(D) Synapse

Answer: C

Question 4: What is the name of the space between the presynaptic and postsynaptic neurons?

(A) Synaptic cleft
(B) Axon hillock
(C) Node of Ranvier
(D) Schwann cell

Answer: A

Question 5: Which neurotransmitter is associated with inhibiting postsynaptic potentials?

(A) Glutamate
(B) GABA
(C) Serotonin
(D) Dopamine

Answer: B

Question 6: What is the role of ion channels in neurons?

(A) To maintain the resting membrane potential
(B) To propagate action potentials
(C) To release neurotransmitters
(D) To receive signals from other neurons

Answer: B

Question 7: Which type of synapse is formed by the axon of a presynaptic neuron and the dendrite of a postsynaptic neuron?

(A) Axodendritic
(B) Axoaxonal
(C) Dendrodendritic
(D) Axoma

Answer: A

Question 8: What is the term for the sudden increase in electrical activity at the axon hillock that triggers an action potential?

(A) Depolarization
(B) Hyperpolarization
(C) Threshold potential
(D) Refractory period

Answer: C

Question 9: Which part of the neuron is responsible for synthesizing proteins?

(A) Axon
(B) Dendrite
(C) Cell body
(D) Myelin sheath

Answer: C

Question 10: What is the function of the ion pump in neurons?

(A) To create the resting membrane potential
(B) To propagate action potentials
(C) To maintain ion concentrations
(D) To release neurotransmitters

Answer: C