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Central and Peripheral Nervous System quiz #1

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  • What are the main differences between the central nervous system (CNS) and the peripheral nervous system (PNS) in terms of structure and function?
    The CNS consists of the brain and spinal cord, serving as the body's command center, with gray matter on the outside and white matter inside the brain (the reverse in the spinal cord). The PNS includes all nerves and ganglia outside the CNS, relaying information to and from the CNS. The PNS is divided into the somatic system (voluntary control of muscles) and the autonomic system (involuntary control of organs), and it connects the CNS to the rest of the body.
  • Describe the roles of the forebrain, midbrain, and hindbrain, and identify key structures and their functions within each region.
    The forebrain includes the cerebrum (responsible for thinking, planning, and sensory interpretation), thalamus (sensory relay), hypothalamus (homeostasis and endocrine link), hippocampus (memory), and amygdala (emotion). The midbrain connects the forebrain and hindbrain, and is involved in eye movement, alertness, and processing visual/auditory information. The hindbrain contains the cerebellum (motor coordination), pons (breathing, sleep, posture), and medulla oblongata (heart rate, blood pressure, basic life functions).
  • What are the main structural differences between gray matter and white matter in the brain and spinal cord?
    In the brain, gray matter is on the outside and white matter is inside, while in the spinal cord, gray matter is inside and white matter is outside.
  • What is the primary function of the blood-brain barrier in the central nervous system?
    The blood-brain barrier protects the CNS by preventing toxins and pathogens in the blood from entering the brain and spinal cord.
  • How is the peripheral nervous system (PNS) organized, and what are its main divisions?
    The PNS consists of nerves and ganglia outside the CNS and is divided into the somatic (voluntary control) and autonomic (involuntary control) systems.
  • What is a reflex arc and how does it function in the nervous system?
    A reflex arc is a neural pathway that enables quick, involuntary responses to stimuli by sending signals through the spinal cord without involving the brain.
  • Name the major regions of the brain and one key function for each.
    The forebrain handles thinking and sensory interpretation, the midbrain processes visual/auditory information and eye movement, and the hindbrain controls motor coordination and basic life functions.
  • What roles do the hippocampus and amygdala play in the brain?
    The hippocampus is essential for forming long-term and spatial memories, while the amygdala is involved in emotional processing.
  • What is neuroplasticity and why is it important for brain function?
    Neuroplasticity is the brain's ability to reorganize and form new neural connections, which is crucial for learning, memory, and recovery from injury.
  • How does long-term potentiation contribute to memory formation?
    Long-term potentiation strengthens synaptic connections by increasing neurotransmitter release and receptor numbers, supporting the storage of long-term memories.