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

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Question 1 of 7

Biology

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

1.Motor neuron and sensory neuron

2.Axon and dendrite

3.Ventral horn and dorsal horn

4.Sense organ and muscle effector

Question 1 of 7

Question 2 of 7

2. 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.A nerve impulse is an all or none phenomenon

4.There is a potential difference across the axon membranes

Question 2 of 7

Question 3 of 7

3. The cell transmits impulses from the:

1.Receptor cells to the spinal cord

2.Spinal cord to the effector organ

3.Receptor cells to the effector organ

4.Effector organ to the spinal cord

Question 3 of 7

Question 4 of 7

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

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

2.Na⁺ into the axon to bond with K⁺

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

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

Question 4 of 7

Question 5 of 7

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

1.Cholinesterase

2.Atropine

3.Noadrenaline

4.Acetylcholine

Question 5 of 7

Question 6 of 7

6. Where are neurotransmitter receptors located?

1.On the nuclear membrane

2.At nodes of Ranvier

3.In the myelin sheath

4.On the postsynaptic membrane

Question 6 of 7

Question 7 of 7

7. 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.Muscle paralysis

3.Inhibition of acetylcholine

4.Inhibition of cholinesterase

Question 7 of 7

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Test By Topics	12th Class Biology

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

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