Related QA - Biology - neuron
15640.Four healthy people in their twenties got involved in injuries resulting in damage and death of a few cells Of the following, which cells are least likely to be replaced by new cells?
Osteocytes
Liver cells
Neurons
Malpighian layer of the skin
15665.The most appropriate definition for neuroglial cells is that they are______.
Nonsensory supporting cells
Secretory cells
Sensory cells
Sensory and supporting cells
17329.Statements about the mechanism of muscle contraction are given below:
I. Acetylcholine is released when the neural signal reaches the motor end plate.
II. Muscle contraction is initiated by a signal sent by CNS via a sensory neuron.
III. During muscle contraction isotropic band gets elongated.
IV. Repeated activation of the muscles can lead to lactic acid accumulation.
Identify the correct statements.
I and IV are correct
I and III are correct
II and III are correct
I, Il and III are correct
17382.The Junction between a nerve cell and the motor unit is called
Creatine phosphate
Synapse
Neuromuscular junction
Sarcomeres
17426.Motor neurons electrically stimulate nearby muscle fibers at ______.
Creatine phosphate
Actin filament
Neuromuscular junction
Cross-bridges
17438.Molecules of neurotransmitter, released from the presynaptic neuron bind to receptors on the ______.
Postsynaptic membrane
Cell body
Axonal membrane
None of these
17449.Preganglionic neurons lie within the ______.
Parasympathetic nervous system
Sympathetic nervous system
Peripheral nervous system
Central nervous system
17464.Assertion: The imbalance in concentration of Na+, K+ and proteins generates resting potential.
Reason: To maintain the unequal distribution of Na+ and K+, the neurons use electrical energy.
Reason: To maintain the unequal distribution of Na+ and K+, the neurons use electrical energy.
Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
Both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
Assertion is true, but Reason is false.
Both Assertion and Reason are false.
17466.When a neuron is in resting state i.e. not conducting any impulse, the axonal membrane is
Comparatively more permeable to K+ ions and nearly impermeable to Na+ ions
Comparatively more permeable to Na+ ions and nearly impermeable to K+ ions
Equally permeable to both Na+ and K+ ions
Impermeable to both Na+ and K+ ions
17468.Which neuroglia cells produce a fatty insulating material called myelin?
Satellite cells
Schwann cells
Both 1 and 2
Neither 1 nor 2
17470.Which one of the followings is responsible for the improvement of nutrient flow to the neurons and provides electrical insulation?
Neuroglia
Motor neuron
Sensory neuron
Interneuron
17477.Which one of the followings is not correct about neuroglial cells?
Generate or transmit impulses
Maintain healthy concentrations of important chemicals in the fluid
Provide physical support and protection to neurons
In PNS, responsible for myelination (Schwann cells)
17482.In the PNS, the neuroglial cells that form protective myelin sheaths are ______.
Microglia
Ganglionic cells
Oligodendrocytes
Schwann cells
17484.At a neuromuscular junction, synaptic vesicles discharge ______.
Acetylcholine
Epinephrine
Adrenaline
None of these
18223.Match the following and choose the correct answer.
| Column I | Column II |
|---|---|
| A. Phobia | 1. Maladaptive habit |
| B. Neurosis | 2. Undue concern about health |
| C. Hypochondria | 3. Lack of sleep |
| D. Insomnia | 4. Intense fear |
A – 2, B – 1, C – 4, D – 3
A – 2, B – 1, C – 3, D – 4
A – 4, B – 1, C – 3, D – 2
A – 4, B – 1, C -2, D – 3
18233.Column I lists some disorders associated with brain. Column II lists the causes for these disorders. Match the two columns and identify the correct option from those given below.
| Column I | Column II | ||
|---|---|---|---|
| A | Epilepsy | p | Degeneration of neurons in the cerebral cortex |
| B | Alzheimer's disease | q | Irregular electrical discharge in the neurons |
| C | Parkinson's disease | r | Decreased production of acetylcholine |
| D | Huntington's chorea | s | Degeneration of dopamine releasing neurons |
| t | Formation of blood clots in the brain | ||
A = t, B = s, C = r, D = p
A = q, B = r, C = p, D = s
A = q, B = r, C = s, D = p
A = q, B = s, C = r, D = p