Blood and the Circulatory System

Functions of the Circulatory System Transport of Substances Oxygen/carbon dioxide Glucose Hormones Immune system cells Nutrients Cellular waste Thermoregulation

Blood Plasma Water Clotting proteins Antibodies Red Blood cells ¼ of your 3 trillion cells! Hemoglobin No organelles Platelets Begin clotting process Immune cells

Blood vessels Arteries: Thick, stretchy walls Muscular squeezing Arterioles Veins: Thinner walls, wider space Valves Helped by skeletal muscle Venioles: Capillaries: more later

3 types of circulation Pulmonary Circulation Systemic Circulation Cardiac Circulation “The Body." IESB Year 6 Science. 29 Apr

An easier schematic Mark, R.G., R.D. Kamm, E.B. Shim, and T. Heldt. "Computational modeling of cardiovascular response to orthostatic stress." - Physiome Model Repository. 29 Apr

Capillary Exchange The MAIN THING this unit Respiratory System: exchange of O 2 and CO 2 Digestive System: Glucose and other nutrients in Urinary System: Urea and metabolic wastes out Reproductive System: O 2 and nutrients to fetus, CO 2 and waste out Diffusion across capillary walls Movement along concentration gradient One cell thin! Thermoregulation (exchange of heat)