Punjab 12th Class Biology Chapter 17 Coordination and Control Mcqs Test Online

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Question 1 of 7

Biology

1. Depolarization of an axon is produced by the movement of:

1.Na⁺ into the axon to bond with K⁺

2.Na⁺ and K⁺ within the axon toward the axon terminal

3.K⁺ into the axon and Na⁺ out of the axon

4.Na⁺ into the axon and K⁺ out of the axon

Question 1 of 7

Question 2 of 7

2. Which of these are the first and last elements in a spinal reflex?

1.Motor neuron and sensory neuron

2.Ventral horn and dorsal horn

3.Sense organ and muscle effector

4.Axon and dendrite

Question 2 of 7

Question 3 of 7

3. Where are neurotransmitter receptors located?

1.In the myelin sheath

2.On the postsynaptic membrane

3.On the nuclear membrane

4.At nodes of Ranvier

Question 3 of 7

Question 4 of 7

4. The function of the nerve gas is to inhibit the function of:

1.Atropine

2.Cholinesterase

3.Acetylcholine

4.Noadrenaline

Question 4 of 7

Question 5 of 7

5. What will happen it the receptor sites on the post-synaptic membrane are blocked by a drug at the neuromuscular junction?

1.Muscle contraction

2.Inhibition of cholinesterase

3.Inhibition of acetylcholine

4.Muscle paralysis

Question 5 of 7

Question 6 of 7

6. The cell transmits impulses from the:

1.Receptor cells to the effector organ

2.Spinal cord to the effector organ

3.Effector organ to the spinal cord

4.Receptor cells to the spinal cord

Question 6 of 7

Question 7 of 7

7. Impulses travel very rapidly along nerves to the leg of a man. Which fact accounts for the speed at which they travel?

1.The nerves contain myelinated fibres

2.There is a high concentration of Na⁺ ions inside the axons

3.There is a potential difference across the axon membranes

4.A nerve impulse is an all or none phenomenon

Question 7 of 7

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