nervous system

• Nervous system>>>

  - A specialised network of cells in our human body. based on electrical and chemical signals

  - (endocrine system based on hormones)

  - split into two divisions - central nervous system (CNS) and peripheral nervous system (PNS)

  - function>>>

  - collect, process and respond to information from the environment

  - coordinate the work of different organs and cells
• central nervous system (CNS)>>>

  - Made up of the brain and spinal cord

  - The brain is divided into two hemispheres

  - Cerebral cortex is the outer layer 3mm thick

  - The brain is more developed in humans than other animals

  - The spinal cord connects is the brain to the peripheral nervous system (PNS) and this responsible for reflexes
• Peripheral nervous system (PNS)>>>

  - It's subdivided into the autonomic nervous system and the somatic nervous system

  - Autonomic nervous system (ANS) -governs vital functions e.g heart rate, breathing, stress

  - subdivides into the sympathetic and paraympathetic nervous system

  - Semantic nervous system (SNS) - muscle movements