The circulatory system is the bodys highway system

The circulatory system is the body’s highway system for transporting materials. HDelivers oxygen to cells HTake carbon dioxide away from cells HDelivers food to cells so they can grow and make energy. HCarries hormones to organs HCarries antibodies places that need healing HDelivers heat where needed

Red Blood Cells aka “Erythrocytes”: 4 Carry O 2 and CO 2 (primarily contains Hemoglobin) 4 Made in bone marrow 4 Old ones destroyed in Liver and Spleen White Blood Cells aka “Leukocytes”: 4 Immune System…different types Platelets: 4 Needed for blood clotting Plasma: liquid made of the following: 4 Water – solvent to carry other things. Absorbs heat 4 Salts – osmotic balance, p. H buffering, regulates membrane permeability 4 Plasma proteins – albumin (osmotic balance and p. H buffering), fibrinogen (clotting), globulins (antibodies, and lipid transport)

Arteries (carry blood away from heart) Arterioles (enters tissues/organs) Capillaries (one cell thick) Tissues and organs Venules Veins (carry blood back to heart)

It is the size of your fist. Contains 4 chambers © 2 atria © 2 ventricles

Superior vena cava/Inferior vena cava Right Atrium Right Ventricle Pulmonary Artery Lungs Pulmonary veins (4 of them) Left Atrium Left Ventricle Aorta Body

What is it? Pressure the blood exerts against the inner walls of the blood vessels. Blood vessels are not rigid…they are elastic (they can expand contract) During each beat of the heart, the pressure rises and falls. It is how the blood continues to circulate between heartbeats. How is it measured? Two arterial pressures are measured. Systolic pressure – the pressure in the arteries at the peak of ventricular contraction (top number) Diastolic pressure – the pressure when the ventricles are relaxing. (bottom number)

Increase/decrease blood volume Increase/decrease the amount of friction the blood encounters as it flows through the arteries. Vasoconstriction (narrowing of the blood pressure) controlled by the brain. Temperature Chemicals Diet Age, Race, Mood, Physical activity, Posture