A Neurological disorder that is characterised by impairments in motor performance and coordination are known as

Correct Answer: B

Rationale: Apraxia is a neurological disorder that affects the ability to perform purposeful movements, despite having the physical ability and desire to do so. Individuals with apraxia may struggle with tasks like dressing, cooking, or using tools. This condition is often caused by damage to the parietal lobe or other areas of the brain involved in motor planning and execution.

Correct Answer: D

Rationale: Schwann cells are a type of neuroglial cell found in the peripheral nervous system (PNS). They are responsible for producing myelin, which insulates axons and enhances the speed of nerve impulse transmission. Other types of neuroglial cells include astrocytes, oligodendrocytes, and microglia, each of which supports and protects neurons in different ways. Schwann cells are essential for maintaining the health and function of peripheral neurons.

Correct Answer: A

Rationale: The refractory period is a brief time following an action potential during which a neuron is unable to fire another impulse. This period ensures that action potentials propagate in one direction and allows the neuron to reset its ion gradients. The refractory period is divided into the absolute refractory period, when no new action potentials can be generated, and the relative refractory period, when a stronger-than-usual stimulus is required to generate an action potential.

Correct Answer: D

Rationale: The brain is protected by multiple layers of defense, including the meninges (protective membranes), cerebrospinal fluid (a cushioning fluid), and the bony skull. The meninges consist of three layers—dura mater, arachnoid mater, and pia mater—that provide structural support and protection. Cerebrospinal fluid surrounds the brain and spinal cord, acting as a shock absorber. The skull provides a rigid barrier against physical injury. Together, these structures safeguard the brain from damage.

Correct Answer: B

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.