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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

Human Physiology

A short introduction to the field of human physiology

introduction
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
homeostasis
Homeostasis
  • This is the name for the processes which keep the condition and environment of the tissues in the proper condition to sustain life.
cells
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)
tissues
Tissues
  • muscle
  • nervous
  • epithelial
  • connective
glands
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
organs
Organs
  • Two or more types of primary tissue
  • Organized to perform a particular function
examples of organs
Examples of Organs
  • Stomach
  • Heart
  • Liver
  • Kidneys
  • brain
  • many others
homeostasis the essence of life
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

body systems
Body Systems
  • Nervous
  • Endocrine
  • Immune
  • Circulatory
  • Muscle/skeletal
  • Integument
  • Respiratory
  • Urinary
  • Digestive
  • Reproductive
negative feedback
Negative Feedback

Fall in temperature

+

-

Thermostat

Heat

Connecting

Circuit

Furnace

+

negative feedback12
Negative Feedback

Fall in blood pressure

+

-

Pressure sensors

Increase in

blood pressure

Nerves

Heart and blood

vessels

+

failure of homeostasis
Failure of Homeostasis
  • Often leads to sickness and eventually death
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