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. 2014 <http://iesbscience.wordpress.com/the-body/>.

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. 2014 <http://models.cellml.org/exposure/ff8be5f140e68612284488cf9879eb5f/lpc.cellml/view>.

Capillary Exchange

• The MAIN THING this unit• Respiratory System: exchange of O2 and

CO2

• Digestive System: Glucose and other nutrients in

• Urinary System: Urea and metabolic wastes out

• Reproductive System: O2 and nutrients to fetus, CO2 and waste out

• Diffusion across capillary walls• Movement along concentration gradient• One cell thin!

• Thermoregulation (exchange of heat)