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Human Physiology

Human Physiology

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Human Physiology

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  1. Human Physiology A short introduction to the field of human physiology

  2. Introduction • Living systems possess a special organization • Physiology studies two related aspects of that organization: structure and function • For this reason physiology is closely related to Anatomy and Biochemistry

  3. Homeostasis • This is the name for the processes which keep the condition and environment of the tissues in the proper condition to sustain life.

  4. Cells • Cells are the basic units of life • they make up tissues and organs in the body • Cells can only come from other cells (The CELL THEORY)

  5. Tissues • muscle • nervous • epithelial • connective

  6. Glands • Epithelial tissue • Specialized for secretion • Exocrine glands: secrete through ducts to the outside of the body • Endocrine glands: ductless glands which produce hormones which are released into the blood

  7. Organs • Two or more types of primary tissue • Organized to perform a particular function

  8. Examples of Organs • Stomach • Heart • Liver • Kidneys • brain • many others

  9. Homeostasis: The Essence of Life • Cells live in a fairly constant environment • The cells, in turn, constitute the tissues which provide that environment Homeostasis Body systems Cells

  10. Body Systems • Nervous • Endocrine • Immune • Circulatory • Muscle/skeletal • Integument • Respiratory • Urinary • Digestive • Reproductive

  11. Negative Feedback Fall in temperature + - Thermostat Heat Connecting Circuit Furnace +

  12. Negative Feedback Fall in blood pressure + - Pressure sensors Increase in blood pressure Nerves Heart and blood vessels +

  13. Failure of Homeostasis • Often leads to sickness and eventually death