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NEET Questions / Zoology / Neural Control And Coordination / Reflex Action And Reflex Arc
A patient presents with a complete transection of the spinal cord at the T10 level. Which reflex would MOST likely be ABSENT while all others remain intact?
Pupillary light reflex
Biceps reflex
Patellar reflex
Withdrawal reflex (in the foot)
Damage to the Renshaw cells in the spinal cord would MOST likely result in which of the following?
Loss of all reflexes
Hypotonia and muscle weakness
Sustained muscle contractions and spasms
Enhanced reciprocal inhibition
Which neurotransmitter is primarily involved in the monosynaptic stretch reflex?
GABA
Glycine
Acetylcholine
Glutamate
In a hypothetical scenario where a new reflex is discovered, and it involves three interneurons within the spinal cord between the sensory and motor neurons, how would this reflex be classified?
Monosynaptic
Disynaptic
Trisynaptic
Polysynaptic
The crossed-extensor reflex is crucial for maintaining balance during which activity?
Sitting upright
Writing with a pen
Reading a book
Stepping on a sharp object
A lesion in the dorsal root ganglion would MOST directly affect which component of the reflex arc?
Motor neuron
Interneuron
Effector muscle
Sensory neuron
Which of the following is NOT a component of a reflex arc?
Receptor
Effector
Brain
Sensory neuron
The immediate response to touching a hot object is an example of a:
Reflex action
Voluntary action
Learned behavior
Conscious decision
Which part of the central nervous system primarily controls reflex actions?
Brain
Cerebellum
Spinal cord
Medulla oblongata
What is the function of an effector in a reflex arc?
To detect the stimulus
To transmit the impulse to the spinal cord
To carry out the response
To interpret the stimulus
