Class 12 Biology · Chapter 3 · Test 2
Nerve Impulse and Synapse
48 MCQs
48 questions · 40 min · 48 marks
Want to try first? Take the free Biology test: Homeostasis and Feedback Mechanisms
Sample questions
The first 5 of 48. Try each one, then tap to see the answer.
Question 1
Neurotransmitter receptors are located on:
- ANuclear membrane
- BNodes of Ranvier
- CPostsynaptic membrane
- DMyelin sheath
Show answerHide answer
Answer: C
Neurotransmitters bind to receptor proteins on the postsynaptic membrane.
Question 2
Which neurotransmitter is released by all motor neurons at their synapses with skeletal muscles?
- AAcetylcholine
- BGABA
- CNorepinephrine
- DDopamine
Show answerHide answer
Answer: A
Acetylcholine acts at neuromuscular junctions to contract skeletal muscles.
Question 3
During saltatory conduction the nerve impulse jumps from one ___ to another.
- AAxon
- BSynapse
- CMyelin sheath
- DNode of Ranvier
Show answerHide answer
Answer: D
Action potentials jump between nodes of Ranvier skipping myelinated regions.
Question 4
In a resting neuron which of these ions has the highest permeability?
- AChloride
- BSodium
- CPotassium
- DCalcium
Show answerHide answer
Answer: C
K+ leaks out through K+ gates making the resting membrane most permeable to potassium.
Question 5
If nerve impulses in neuron 'a' are travelling faster than in neuron 'b' what might be the reason?
- AHyperpolarization in neuron 'a'
- BNeuron 'a' is myelinated
- CThere is a high concentration of sodium ions inside neuron 'a'
- DNeuron 'a' is thicker than neuron 'b'
Show answerHide answer
Answer: B
Myelination allows saltatory conduction which greatly increases impulse velocity.
More tests in Human Nervous System
- Neurons and Reflex Arc
MCQs · 36 questions · 30 min · 36 marks
- Brain and Spinal Cord
MCQs · 36 questions · 30 min · 36 marks
- Peripheral and Autonomic Systems
MCQs · 35 questions · 30 min · 35 marks
- Receptors and Drugs
MCQs · 38 questions · 30 min · 38 marks
- Nervous Disorders and Tests
MCQs · 35 questions · 30 min · 35 marks
Practise with a free account
Save your scores, see which chapters need work, and keep a notebook of every question you got wrong.