22) The f 1. Sodium channels are inactivated. 2. P ollowing are the main steps i

Question

22) The f 1. Sodium channels are inactivated. 2. P ollowing are the main steps in the generation of an action potential otassium channels open and potassium moves out of the cell, initiating repolarization. 3. Sodium channels regain their normal properties. 4. A graded depolarization brings an area of an excitable membrane to threshold. 5. A temporary hyperpolarization occuns 6. Sodium channel activation occurs. 7. Sodium ions enter the cell and depolarization occurs The proper sequence of these events is A) 4, 6, 7,3,2, 5, 1 ?) 4, 6, 7, 1,2, 3,5 C) 5, 7,4, 1,2, 3,5 D) 2,4,6,7, 1,3,5 E) 4,2,5, 6,7,3,1 23) The all-or-none principle states that A) all stimuli will produce identical action potentials B) all stimuli great enough to bring the membrane to threshold will produce identical action potentials C) the greater the magnitude of the stimuli, the greater the intensity of the action potential. D) only sensory stimuli can activate action potentials E) only motor stimuli can activate action potentials. 24) Neurotransmitters are released from the A) dendrites. B) synaptic terminals/knobs. C) collaterals. D) hillock E) synapse. 25) The ion needed to initiate the release of acetylcholine into the synaptic cleft is A) sodium. B) potassium. C) calcium. D) chloride. E) zinc. 26) Which of the following lists the parts of a reflex arc in the correct order? A) receptor, sensory neuron, interneuron, motor neuron, effector B) receptor, effector, sensory neuron, interneuron, motor neron C) receptor, sensory neuron, effector, interneuron, motor neuron D) effector, receptor, sensory neuron, interneuron, motor neuron E) receptor, interneuron, sensory neuron, motor neuron, effector

Explanation / Answer

Answers -

Question 22 . The option (b) Is correct. The order follow by 4,6,7,1,2,3,5.

Question 23. The option ( c) us correct. The greater the magnitude of the stimuli, the greater the action potential.

Explanation - when a suitable amount of therosold action potential applied on muscle so it will contract with same therosold potential.

Question 24. The option (b) is correct. Synaptic terminal /knob.

Explanation - synaptic knob have nerve ending which contains synaptic vesicle which store neurotransmitters .

Question 25. The option (c) is correct. Calcium.

Explanation - calcium ion puss the synaptic vesicle towards the pre- synaptic membrane.

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