Which of the following cells transmit action potentials? A) astrocytes B) neuron
ID: 85187 • Letter: W
Question
Which of the following cells transmit action potentials? A) astrocytes B) neurons C) microglia D)oligodendrocyte E) Schwann cells During repolarization of a neuron, A) sodium channels close and potassium rushes out of the cell to temporarily re-establish the membrane potential. B) potassium channels close, preventing further loss of positive ions. C) the sodium-potassium pump is turned off. D) sodium channels open to allow sodium ions to rush back out of the cell. E) the membrane potential is eliminated. Neurotransmitters are stored in A) the dendrite B) the synapse neuron C) the presynaptic D) the postsynaptic neuron During this process (Fig 1), influx of ___ cause(s) vesicles in the axon bulb to fuse with the cell membrane, releasing ___ A) mitochondrion, neurons B) Ca^2+, neurotransmitter C) neurotransmitters D) vesicles, neurons E) neurons, mitochondrion Insufficient production of acetylcholine in the synapses of the brain, abnormal tangled neurons, and large deposits of beta amyloid are problems associated with A) meningitis. B) Alzheimer's disease C) rabies D) Parkinson's disease. E) epilepsy Match the following: A) sensory neurons B) interneuron C)motor neuron Neurons found in the PNS that receive stimuli and transmit information to the CNS ___. Neuron found in the PNS that transmit information away from the CNS ___. Transmit information between neurons ____. The central nervous system is enclosed by membranes or meninges called the A) dura mater, alma mater, and pla mater B) fore, mid and hind meninges C) dura mater, pla mater and arachnoid D) pleura, parietal, and arachnoid E) glial Schwann, and interstitialExplanation / Answer
Answer 14) The correct answer is (B).
Neurons are responsible for the transmission of the action potential.
Microglia is considered as the immune defence system which provides protection to the central nervous system from various pathogens. Schwann cells are responsible for the synthesis of the myelin sheath. Oligodendrocytes are similar to the astrocytes and involved in the synthesis of myelin sheath.
Answer 15) The correct answer is option (A).
During the repolarization of a neuron, the voltage-gated sodium channels get closed and potassium channels opened which causes the efflux of potassium ions until membrane potential reaches -75mV to -90mV.
Sodium channels open to allow sodium ions to rush back out of the cell during the depolarization of neuron.
Answer 16) The correct answer is option (B).
Neurotransmitters are stored in the synapse in synaptic vesicles. These are produced in the cytosol of presynaptic axon terminal.
Answer 17) The correct answer is option (B).
During this process, influx of calcium ions causes conformational change in the protein which results in the release of vesicles containing neurotransmitters. These vesicles transfer their content to the synaptic cleft.
Answer 18) The correct answer is option (B).
Acetylcholine is an important neurotransmitter which involves in the processing of memory and learning. The insufficient production of acetylcholine causes memory and concentration problems in Alzheimer's patients.
Answer 19) (A)Sensory neurons
Answer 20) (C) Motor neurons
Answer 21) (B) Interneuron
Answer 22) The correct answer is option (C).
Meninges are made up of three layers: dura mattter (outermost layer), arachnoid (middle layer) and pia matter (innermost layer).
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