Question

true or false

1. the average brain weighs 7 pounds
2. the brain is attached to the skull.
3. the corpus callosum connects the two hemispheres of the brain.
4. there are four lobes in each hemisphere.
5. the brain floats in cerebrospinal fluid.
6. neurons are the basic brain cells.
7. the brain communicates via chemicals.
8. neurotransmitters pass directly from the axon to the dendrite.
9. the brain continues to grow new neurons after birth.
10. each lobe of the brain has specific functions.

Explanation:

1. The average adult brain weighs about 3 pounds, not 7 pounds.
2. The brain is not directly attached to the skull; there are meninges and cerebrospinal - fluid in between.
3. The corpus callosum is a thick band of nerve fibers that connects the two hemispheres of the brain.
4. Each cerebral hemisphere has four main lobes: frontal, parietal, temporal, and occipital.
5. The brain floats in cerebrospinal fluid which cushions it.
6. Neurons are the basic functional cells of the brain.
7. The brain communicates via chemical messengers called neurotransmitters.
8. Neurotransmitters are released from the axon terminal into the synapse and then bind to receptors on the dendrite, not pass directly.
9. The brain can generate new neurons (neurogenesis) after birth, especially in certain areas like the hippocampus.
10. Each lobe of the brain has specific functions such as the frontal lobe for executive functions, etc.

Answer:

1. False
2. False
3. True
4. True
5. True
6. True
7. True
8. False
9. True
10. True