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Nervous System - Nervous System Functions Regulates...

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Nervous System Functions Regulates internal body metabolism (internal environment) body temp, urine volume, blood volume, gas exchange, circulation, movement Llnk to the external environment- (interpreter) sensory devices- sight, hearing, taste, smell, touch (pressure, pain, hot, cold) emotional response to external stimuli (these drive desire to satisfy physical needs to preserve homeostasis) hunger, thirst, temperature, rest, sexuality The Two Types of Neural Pathways Sensory (afferent) nerves transmit messages from sensors to CNS sensory receptors located the ends of peripheral nerves that detect external and internal environmental changes and relays info to brain light and sound intensity touch- changes in skin pressure temperature variation oxygen concentration in fluids of the body impulses are brought to CNS where they are integrated to create sensations Conscious or subconscious decisions are made and acted upon by motor functions Motor (efferent)- nerves transmit messages from CNS to effectors muscles that contract glands that secrete Nervous Tissue Central - consist of the brain and the spinal cord incoming sensory signals from PNS travel to the CNS for processing out going signals to from CNS to PNS Peripheral - connects the sensory receptors,glands, and muscles in the peripheral part of the body to the CNS Peripheral Nervous System Types of Neurons Input components consist of sensory (afferent) neurons. The output component consist of motor ( efferent ) neurons. Interneurons (association) neurons carry nerve impulses from sensory to motor neurons and are located in the CNS. Peripheral Nervous System Sub divided into Somatic nervous system consist of sensory neurons that convey information from cutaneous and special sense receptors primarily in the head, body wall, and limbs to the CNS and motor neurons from the CNS that conduct impulses to skeletal muscles only.
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is voluntary Peripheral Nervous System Autonomic nervous system consist of motor neurons from the CNS that conduct impulses to smooth muscle, cardiac muscle, and glands. Is involuntary Consist of two branches sympathetic - controls those process that tend to expend energy (speedup heart beat). parasympathetic - control those process that tend to conserve energy (slow the heart beat). Nervous System Histology Consist of two types of neurons Neuroglia - serve to support and protect the neurons. generally smaller than neurons and outnumber neurons 5-50 times. Neurons - the main cell of the nervous system that is specialized for nerve impulse conduction. Neuroglia Central Nervous System Astrocytes Oligodendrocytes Microglia cells Ependymal cells Peripheral neuroglia schwann cells (neurolemmocytes) satellite cells Central Nervous System Neuroglia Central Nervous System Neuroglia Astrocytes are the most abundant and functionally diverse
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