Science - Nervous, Circulatory, Respiratory

• The heart is the organ that pumps blood around the body.
• The nervous system is made of the nerves, spinal cord, brain
• Central Nervous system is made of the brain and spinal cord
• Nervous system is made of the Central Nervous system and Peripheral nervous system
• Peripheral nervous system makes up the nerves outside the Central Nervous System.
• Peripheral Nervous System made up of 2 Systems. Somatic and Autonomic system
• Autonomic Nervous System is made of 2 systems. Sympathetic and Parasympathetic nervous system
• Sympathetic Nervous System is your fight or flight reflexes. Increases heart rate.
• Parasympathetic nervous system is the rest and digest system. It is the opposite of the sympathetic nervous system. Decreases heart rate.
• How does the blood keep moving?

  Musculatory system - muscles contract to increase pushing force to keep blood moving Valves - open and close to prevent blood from going backwards (when muscles contract) Breathing - Movements cause pressure in veins in chest
• Arteries - carry oxygenated blood AWAY from the heart.
• Capillaries - point of exchange, takes nutrients from the blood

  ex: oxygen and carbon dioxide
• Veins - carry deoxygenated blood TO the heart.
• How does your cells obtain nutrients and dispose wastes?

  Obtain - blood transports nuterients to cells, capillaries take wastes to the cell membrane

  Dispose - through cell membrane back through the capillaries; opposite way from obtaining
• Respiratory System - supplying oxygen to body cells and removes carbon dioxide.
• Diaphragm - contracts and moves down to breathe in, relaxes and moves up to breathe out
• Air passes through the: 1/ nose or mouth 2/ pharynx 3/ Larynx 4/ Epiglottis 5/ Trachea 6/ Bronchi 7/ Alveoli