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Circulatory & Respiratory Systems Circulatory System • FUNCTION – Transport O2 , CO2 & waste – Distributes nutrients & hormones – Regulates body temperature – Protects against blood loss & disease Made up of… • Heart – Pumps blood • Vessels – Carry blood to body & back to heart • Blood – Contains red & white blood cells, platelets, and plasma Heart Parts • Right Ventricle • Right Atrium • Left Ventricle • Left Atrium Flow of Blood in Heart • From body through the vena cava into the right atrium • Right atrium to right ventricle • Right ventricle to lungs • From lungs to left atrium • Left atrium to left ventricle • Left ventricle through the aorta out to the body Vessels • Arteries & Arteriolies – Smooth, thick muscle – Pumps blood away from heart – AORTA • Capillaries – Smallest vessel – 1 cell thick – Exchange of materials between body & blood • Venules & Veins – Smooth, thick muscle – Returns blood to heart – VENA CAVA Respiratory System • Supplies the blood with oxygen – Red Blood Cells (hemoglobin) • Removes carbon dioxide from blood Made up of… • Mouth & Nose • Pharynx • Trachea • Bronchi – Bronchioles • Lungs Gas Diffusion • Capillaries from the circulatory system are next to the alveolus (alveoli) • This allows oxygen to diffuse into the blood & carbon dioxide to diffuse into the alveolus