David has been experiencing persistent headaches and cognitive difficulties. His MRI reveals a tumor that has spread from his kidneys to his brain. Doctors explain that his symptoms are likely due to the presence of multiple tumors in his cerebral tissue. Based on this information, which type of tumor is David most likely experiencing? Glioma Meningioma Metastatic tumor Astrocytoma Question 55 (1 point) A scientist is studying nerve injury recovery in mice. They notice that regeneration is significantly more successful in the Peripheral Nervous System (PNS) compared to the Central Nervous System (CNS). Based on known biological differences, what best explains this outcome? The PNS is protected by the blood-brain barrier, which enhances regeneration, while the CNS is not. The PNS contains Schwann cells that promote regeneration, while the CNS contains oligodendrocytes that inhibit regeneration. The CNS has a higher density of neurons, making regeneration more difficult compared to the PNS. The CNS has a faster immune response, which disrupts the regeneration process compared to the PNS Question 56 (1 point) Which of the following scenarios best represents toxic psychosis? A person suffers from depression following a stressful life event. A person experiences hallucinations and paranoia after prolonged methamphetamine