__ are the most common type of cell in the brain that causes tumors.
A Glial cells
B Dura mater cells
C Pyramidal neurons
D Multipolar neurons
E Dopaminergic neurons
The correct answer and explanation is:
The correct answer is A. Glial cells.
Glial cells are the most common type of cell in the brain that cause tumors. These cells are non-neuronal and support the function of neurons. There are several types of glial cells, including astrocytes, oligodendrocytes, and microglia. Among these, astrocytes are the most commonly associated with brain tumors, particularly gliomas, which are a broad category of tumors that arise from glial cells. Gliomas can be either benign or malignant, with malignant gliomas, like glioblastomas, being highly aggressive and difficult to treat.
Unlike neurons, which transmit electrical signals, glial cells are involved in a variety of supportive functions such as maintaining the blood-brain barrier, supplying nutrients to neurons, and removing waste products. They also play a crucial role in the brain’s immune response.
Tumors can develop in glial cells due to mutations in their DNA, which can cause uncontrolled cell division. These mutations can arise from various factors, including genetic predisposition, environmental factors, or even previous brain injuries. Glial tumors tend to occur more often in adults, and they can grow rapidly, leading to symptoms such as headaches, seizures, and neurological deficits depending on their location.
In contrast, other cells mentioned in the options are less likely to give rise to tumors in the brain. For example, dura mater cells are part of the protective coverings of the brain and spinal cord, pyramidal neurons are a type of motor neuron found in the cerebral cortex, and dopaminergic neurons are involved in the production of dopamine but are not typically associated with tumor formation in the brain.