BIOL 3402 Lecture Notes - Lecture 10: Autonomic Nervous System, Central Nervous System, Skeletal Muscle

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11 Sep 2016
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Endocrine system: communicates by means of chemical messengers (hormones) secreted into the blood. Nervous system: communication by means of electrical signals that travel along neurons via neurotransmitters. Central nervous system: the brain and spinal cord enclosed by vertebral column and cranium. Peripheral nervous system: composed of nerves and ganglia. A nerve is a bundle of fibers wrapped in fibrous connective tissue. A ganglion is a knot-like swelling in a nerve where neurons cell bodies are concentrated. Sensory division of peripheral: has somatic (which carries signals to skin, muscles, bones and joints, and involuntary reflexes) and visceral (the autonomic nervous system, which carries signals to viscera, and sympathetic and parasympathetic, largely involuntary) Motor division of peripheral: has somatic ( carries signals to skeletal muscle) and visceral (sends signals to glands, cardiac, and smooth muscle) Sympathetic division: accelerating heart beat and breathing, tendons to arise body for acceleration, fight or flight.

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