Life Processes

• Humans, like all living things, have a set of basic requirements.

• Inputs: water, nutrients, oxygen

• Outputs: waste

• Environment: heat, pressure

• These requirements form part of broader processes that are characteristic of living things.

• Movement – change in position.

• Responsiveness – reaction to a stimulus.

• Respiration – breakdown of simple nutrients to release energy.

• Digestion – breakdown of food into simpler forms.

• Absorption – passage of substances through membranes and into body fluids.

• Circulation – movement of substances in body fluids.

• Assimilation – changing of absorbed substances into chemically different forms.

• Excretion – removal of wastes produced by metabolic reactions.

• Growth – increase in size.

• Reproduction – production of new organisms.

Humans, like all living things, have a set of life processes.