MCQs Biology F.Sc. Part 2 ( 2nd Year )
Chapter No.17
Coordination and Control
Total MCQs = 219
All MCQs taken from Old MDCAT Tests
41. A reflex action involving one or more interneurons between sensory and motor neuron is termed as:
(A) Monosynaptic reflex
(B) Polysynaptic reflex
(C) Hemisynaptic reflex
(D) None of these
Answer:
(B) Polysynaptic reflex
42. Which of the ions are most abundant on the inside and outside of the neuron at its resting potential?
(A) Potassium; sodium
(B) Sodium; potassium
(C) Calcium; phosphate
(D) Sulphate; potassium
Answer:
(B) Sodium; potassium
43. When a neuron reaches at action potential, it depolarizes in:
(A) Second
(B) Millisecond
(C) Microsecond
(D) Nanosecond
Answer:
(B) Millisecond
44. Nerve impulses always travel to the brain through fibers,
(A) Interneuron fibers
(B) Dendrite fibers
(C) Axon fibers
(D) Motor fibers
Answer:
(C) Axon fibers
45. Which of these is true when a neuron is at rest?
(A) The outside is positive
(B) The outside is negative
(C) There is no voltage
(D) The inside is positive
Answer:
(A) The outside is positive
46. The typical neuronal resting membrane potential measures between:
(A) -40 my to -80 mv
(B) -30 mv to -80 mv
(C) -40 mv to -90 mv
(D) -40 mv to -70 mv
Answer:
(C) -40 mv to -90 mv
47. Influx of which ion causes depolarization of the membrane, as the first phase of the action potential?
(A) K+
(B) Na+
(C) K+ and Na+
(D) Ca+
Answer:
(B) Na+
48. Diffused nervous system is present in which animal?
(A) Asymmetrical
(B) Bilaterally symmetrical
(C) Radially symmetrical
(D) All (A), (B) and (C)
Answer:
(C) Radially symmetrical
49. Central nervous system is present in which animal?
(A) Asymmetrical
(B) Bilaterally symmetrical
(C) Radially symmetrical
(D) All (A), (B) and (C)
Answer:
(B) Bilaterally symmetrical
50. How many interneurons does the CNS contain approximately?
(A) 1 trillion
(B) 100 trillion
(C) 1 million
(D) 100 billion
Answer:
(D) 100 billion
