Nervous System

• Nervous system - to coordinate the body’s response to changes in its internal and external environment
• Brain

  • control center of the body, where all processes are relayed through
  • consists of cerebrum (controls though and senses) and cerebellum (controls motor functions)
• Spinal Cord

  • sends instructions from the brain to the rest of the body and vice versa
  • any organism with a major nerve cord is classified as a chordate
• Nerves

  • conduct impulses to muscle cells throughout the bodyneurons
  • clustered into bundles of fibers (axons)
• 3 types of NERVES

  1. Sensory – carry impulses from sense organs to brain and spinal cord.
  2. Motor – from brain or spinal to other organs.
  3. Interneuron – connects sensory and motor neurons.
• Synapse

  point at which a neuron can transfer an impulse to another cell.
• Central Nervous System (CNS) – the control center.
• Brain – 100 billion cells neurons

  1. Cerebrum – largest part, responsible for learning, intelligence, and judgment.
  2. Cerebellum – coordinates and balances actions of muscles. (Posture, movement, and balance.)
  3. Brainstem – regulates blood pressure, heart rate, breathing, and swallowing. (Thalamus, hypothalamus, midbrain, pons, and medulla oblongata.)
• Cell Type - Nervous Tissue