Download - Basic Life Processes
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BASIC LIFE PROCESSES
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Characteristics of a Cell
- Irritability- Conductivity- Contractility- Metabolism- Reproduction- Integration- Adaptation
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NERVE CELLS- the basic structural unit of the
nervous system
- also called the “neuron”
- it is filled with cytoplasm, which is the living material forming the body of the cell.
- neurons vary in size.
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The neuron
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The nervous system is a complex communications
network controlling the body’s internal environment as well as its responses to its surroundings.
complex combination of billions of neurons
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THREE TYPES OF NEURONSAfferent Neurons
- conduct nerve impulses from receptors to the brain or the spinal cord.
Internuncial or Associative Neurons
- responsible for what we commonly call thoughtEfferent Neurons
- conduct nerve impulses from the decision points to the effectors.
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DIVISIONS OF NERVOUS SYSTEM
Central Nervous System
Peripheral Nervous System
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The Central Nervous System
- The Central Nervous System includes the brain and the spinal cord.
- It is the decision-maker.
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The Central Nervous System
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Peripheral Nervous System
- It is composed of two parts
Autonomic nervous system Somatic system
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Peripheral Nervous System
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Autonomic nervous system - is a motor system supplying impulses to
most of the internal organs and smooth muscles of the body.
- composed of two principal divisions:Sympathetic and
Parasympathetic
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The Brain - has an average weight of about three
pounds
- contains at least 15 billion nerve cells called neurons.
- composed of three principal sections:• Hindbrain• Midbrain• Forebrain
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The Brain
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The Principal Sections
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Forebrain is composed of three parts: - Thalamus - Limbic System - Cortex
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THALAMUS -switching pointLIMBIC SYSTEM - involved variety of complex human processesCORTEX - made up of four lobes which are separated by fissures
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