ATI RN
Questions Neurological System Questions
Question 1 of 5
Quadriplegia or tetraplegia refers to paralysis involving what part(s) of the body?
Correct Answer: A
Rationale: Quadriplegia, also known as tetraplegia, refers to paralysis affecting all four limbs and typically the torso. It is usually caused by a spinal cord injury in the cervical region, which disrupts communication between the brain and the limbs.
Question 2 of 5
The upper motor neuron impairment produces the following change of muscles tone:
Correct Answer: B
Rationale: Spasticity is the correct answer because upper motor neuron lesions typically result in increased muscle tone due to the loss of inhibitory signals from the brain. This leads to hyperreflexia, clonus, and rigidity, which are hallmark signs of spasticity. The condition arises from damage to the corticospinal tract, which disrupts the balance of excitatory and inhibitory inputs to the motor neurons.
Question 3 of 5
The damage to IX, X & XII cranial nerves produce:
Correct Answer: A
Rationale: Bulbar palsy is the correct answer because it results from damage to the lower motor neurons of the cranial nerves IX, X, and XII, which are located in the medulla oblongata. This condition leads to dysphagia, dysarthria, and tongue atrophy due to the loss of motor control in the muscles of the pharynx, larynx, and tongue.
Question 4 of 5
The presence of dysdiadochokinesis suggests damage to the following:
Correct Answer: C
Rationale: Cerebellar is the correct answer because dysdiadochokinesis, or the inability to perform rapid alternating movements, is a hallmark sign of cerebellar dysfunction. The cerebellum is responsible for coordinating voluntary movements, and damage to this area disrupts the timing and precision of motor actions.
Question 5 of 5
Deuterium oxide and inulin are injected into a normal 30-year-old man. The volume of distribution of deuterium oxide is found to be 42 L and that of inulin 14 L.
Correct Answer: B
Rationale: Deuterium oxide distributes throughout total body water (TBW), while inulin distributes only in extracellular fluid (ECF). The intracellular fluid (ICF) volume is calculated as TBW - ECF. Here, TBW = 42 L and ECF = 14 L, so ICF = 42 - 14 = 28 L. This calculation is based on the principle that deuterium oxide measures all body water, while inulin is restricted to the extracellular compartment.