“Human Body Systems – College Lecture Notes”

📘 College Biology Note – Human Body Systems

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1. Digestive System - Organs: mouth, esophagus, stomach, small & large intestines - Function: breakdown
and absorption of nutrients


2. Circulatory System - Heart, blood vessels, blood - Function: transport of oxygen, nutrients, hormones,
and waste


3. Respiratory System - Lungs, trachea, bronchi, diaphragm - Function: gas exchange (O₂ in, CO₂ out)


4. Nervous System - Brain, spinal cord, nerves - Function: coordination, response to stimuli, memory


5. Interactions Between Systems - Example: Circulatory + Respiratory = oxygen transport - Example:
Digestive + Circulatory = nutrient distribution


6. Key Terms: - Organs, Tissues, Cells, System, Homeostasis, Hormones




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