Characteristics of Life page

Characteristics of life are traits all organisms share.

1. These characteristics include a. Movement—changing body position or moving internal parts.

b. Responsiveness—sensing and reacting to internal or external changes.

c. Growth—increasing in size without changing in shape.

d. Reproduction—producing offspring.

e. Respiration—obtaining oxygen, using oxygen to release energy from foods, and removing gaseous wastes.

f. Digestion—breaking down food substances into forms that can be absorbed.

g. Absorption—moving substances through membranes and into body fluids.

h. Circulation—moving substances through the body in body fluids.

i. Assimilation—changing substances into chemically different forms.

j. Excretion—removing body wastes.

2. Metabolism is the acquisition and utilization of energy by an organism.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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