Keys to Maintaining Balance in Organisms by Interaction

Regulating Internal Conditions

External Force

• Exercise

• Fright

• Danger

• Threat

• Temperature

• Environment

Extended Learning

• What other systems might be involved in temperature regulation?

• Maintaining Homeostasis involves the interaction of many systems.

• How does change in one system affect another?

• Are these Automatic or Behavioral?

Key Body Systems

• Circulatory System– Provides path to internal systems of the body

• Respiratory System– Provides for gas exchange CO2 for O2

• Nervous System– Controls and coordinates body’s responses

• Endocrine System– Secretes Hormones into the blood system for stress recovery.

Needed–

• Urinary System– Removes wastes produced from work

Nervous System Keys

• Sense– Stress applied by external force (ie exercise)

• Respond– Controls and Coordinates the body’s

response

– Integrates the activities of the organ systems

Circulatory System Keys

• Sense– Monitor Stimuli (ie cold)

– Message to Brain

• Respond (involuntary or automatic)– Change in Blood Flow

– Vessels Constrict

– Major organs protected

– Extremities sacrificed

Endocrine System Keys

• Sense– Needed Hormones for stress reduction

• Respond (automatic) – Glands manufacture and secrete hormone

into the bloodstream

Respiratory/Urinary System Keys

• Exchange of Gases between the air and the circulating blood

• Exchange of cell wastes (toxins) between the blood and external environment

Behavioral Keys

• Sense– External Force

• Respond– Various (view video)