Final answer:
The statement is false; there are multiple types of neurons in the brain, including sensory and motor neurons, in addition to interneurons. Glial cells do not produce action potentials, and axons can be very long. Finally, synapses are often formed between a dendrite and an axon terminal.
Step-by-step explanation:
The statement that "Neurons in the brain are only interneurons" is false. There are multiple types of neurons in the brain, not just interneurons. Neurons can be broadly classified into three main types: sensory neurons, which receive signals from the body's sensory organs and send them to the brain; motor neurons, which send signals from the brain to muscles or glands; and interneurons, which connect neurons within the brain and spinal cord. Interneurons play a critical role in communication within the central nervous system, carrying nerve impulses between sensory and motor neurons. Additionally, the brain also contains glial cells, which are not neurons but support and maintain the functioning of the nervous system.
Glial cells do not produce action potentials; their job is more to support, nourish, and protect neurons. Axons certainly can be over a meter long in adult humans, as seen in the nerves that run from the spinal cord down to the toes. If someone has a stroke and has difficulty with language, it typically indicates damage to the left hemisphere of the brain, which is usually dominant for language in right-handed individuals. Finally, synapses often form where a dendrite and an axon terminal meet, facilitating the transmission of signals between neurons.