Homeostasis opening

Human Body and Homeostasis

By Davine D. Anderson-George

Homeostasis

Homeostasis helps the body maintain a stable internal environment despite external changes.

Examples include gas exchange and cellular respiration, glucose regulation, thermoregulation, osmoregulation.

Different Systems

• Respiratory system: The organs and structures that bring oxygen into the body and remove carbon dioxide. Major parts include the nose, pharynx, larynx, trachea, bronchi, and lungs; gas exchange occurs in the alveoli of the lungs.

• Excretory system (urinary system): The organs that remove metabolic wastes and help maintain fluid and electrolyte balance. Key components are the kidneys, ureters, urinary bladder, and urethra; the kidneys filter blood to form urine, which carries wastes out of the body.

Different Systems

• Nervous system: The network that detects stimuli, processes information, and coordinates responses. It includes the brain, spinal cord, and peripheral nerves; the nervous system controls voluntary and involuntary actions and communicates via electrical and chemical signals.

• Circulatory system (cardiovascular system): The heart, blood vessels, and blood that transport oxygen, nutrients, hormones, and wastes throughout the body. The heart pumps blood through arteries, capillaries, and veins, supporting cellular function and helping maintain temperature and fluid balance.

Systems working together

Systems interact to regulate oxygen, water, and temperature balance.

Feedback mechanisms detect and correct changes in the internal environment.

Systems working together

• Muscles need more oxygen → respiratory rate and cardiac output increase (respiratory + circulatory).
  

• Increased metabolism generates heat → hypothalamus activates (part of the brain) and sweating (circulatory + nervous).

Systems working together

• Sweating causes fluid loss → ADH and thirst mechanisms (endocrine + nervous) increase water retention and drinking behavior; kidneys conserve water (urinary).
  

• All systems coordinate so oxygen delivery, fluid balance, and temperature remain within safe ranges during and after exercise.

Multiple Choice

What systems are being described

During exercise, breathing rate increase; the heart rate rise so more oxygen reaches active muscles.

• Nervous and endocrine systems
• Musculoskeletal and digestive systems
• Immune and integumentary systems
• Cardiovascular and respiratory systems

Multiple Choice

What system is being described:

On a hot day, increased blood flow to the skin and sweating lower body temperature; in the cold, reduced skin blood flow and shivering conserve and generate heat.

• Thermoregulation system
• Body temperature control
• Heat exchange system
• Homeostasis mechanism

Disruption in systems

All systems rely on each other.

1. Give some examples of how the respiratory systems might affect other systems if it is not functioning well.

Disruption in systems

All systems rely on each other.

1. Give some examples of how the excretory systems might affect other systems if it is not functioning well.