Organization of Nervous System PDF

Nervous System 2 Nervous System The nervous system is made up of the brain, spinal cord, and all of the nerves that emerge from them and connect them to the rest of the body. Perhaps the most complex system. The human nervous system detects changes and responds to the...

Nervous System 2 Nervous System The nervous system is made up of the brain, spinal cord, and all of the nerves that emerge from them and connect them to the rest of the body. Perhaps the most complex system. The human nervous system detects changes and responds to them. ▹ Automatic functions ▹ Coordinated or learnt activities  The Nervous System and 3 Homeostasis To maintain homeostasis, the nervous system rapidly regulates and controls body functions and activities by communicating with other body systems that receive and transmit electrical signals throughout the body. ▹ Automatic functions ▹ Coordinated or learnt activities 4 Organization of the Nervous System  Nervous System: 5 Central and Peripheral Together, the Central Nervous System (CNS) and the Peripheral Nervous System (PNS) control sensory input, integration, and motor output. CNS PNS - brain, spinal cord - network of nerves - integrates and - carry sensory processes messages to the CNS, information sent by and send information nerves from the CNS to the muscles and glands  Peripheral Nervous System: 6 Somatic and Autonomic The somatic system The autonomic system consists of: consists of: ▹ sensory receptors (in ▹ neurons (controls head and other organ extremities) systems) ▹ Nerves that carry ▸ glandular sensory information secretions to CNS ▸ smooth and ▹ Nerves that carry instructions from cardiac muscle CNS to muscles 7  Autonomic Nervous System: 8 Sympathetic and Parasympathetic Sympathetic Parasympathetic ▹ Fight or flight ▹ Rest and digest ▹ Prepares the body ▹ Returns the body to for stress a calm state ▹ Cortisol and ▹ Growth hormones, adrenaline DHEA, melatonin ▹ Increases heart rate ▹ Decreased heart and blood pressure rate and blood ▹ Decreases digestion pressure ▹ Repairs the body 9 10 11