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

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Human physiology l.jpg

Human Physiology

A short introduction to the field of human physiology


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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


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Homeostasis

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


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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)


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Tissues

  • muscle

  • nervous

  • epithelial

  • connective


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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


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Organs

  • Two or more types of primary tissue

  • Organized to perform a particular function


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Examples of Organs

  • Stomach

  • Heart

  • Liver

  • Kidneys

  • brain

  • many others


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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


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Body Systems

  • Nervous

  • Endocrine

  • Immune

  • Circulatory

  • Muscle/skeletal

  • Integument

  • Respiratory

  • Urinary

  • Digestive

  • Reproductive


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Negative Feedback

Fall in temperature

+

-

Thermostat

Heat

Connecting

Circuit

Furnace

+


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Negative Feedback

Fall in blood pressure

+

-

Pressure sensors

Increase in

blood pressure

Nerves

Heart and blood

vessels

+


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Failure of Homeostasis

  • Often leads to sickness and eventually death


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