Circulatory System

Functions of the Circulatory System Blood carries oxygen and nutrients to the cells in the body Blood picks up carbon dioxide and carries it away from the cells to the lungs Blood picks up other waste and these are filtered out of the blood by the kidneys

Movement of materials into and out of the blood Diffusion- movement of materials from high to low concentration Active transport – requires energy, usually large molecules or from low to high concentrations

Organs and their functions Heart – causes blood to move through the body by its pumping action

Organs and their functions Blood Vessels – tubes that carry blood throughout the entire body; made of smooth muscle and connective tissue Arteries- vessels that carry blood away from the heart, Veins- carries blood back to the heart Capillaries – small vessels only one cell thick; where gas exchange occurs between the blood and cells

Capillaries – exchanges gases and nutrients with cells oxygen CO2 nutrients

Organs and their functions Blood Carries the oxygen from the lungs to the cells Carries carbon dioxide from the cells to the lungs to be exhaled Carries nutrients to your cells Helps fight infections and heal wounds Contains red and white blood cells, platelets, and plasma

Companion Systems Digestive – the circulatory system carries the nutrients that the digestive system absorbs Respiratory – the circulatory system carries the oxygen the respiratory system takes in and carries CO2 to the lungs to be exhaled Excretory -