Circulatory Circulatory System System

Functions:Functions: Carries oxygen and Carries oxygen and

nutrients to organs nutrients to organs and tissuesand tissues

Transports away Transports away carbon dioxide and carbon dioxide and other waste productsother waste products

Regulates body Regulates body temperaturetemperature

Components:Components:

a. a. Heart Heart --

4 chambers: 4 chambers:

left and right left and right atria, left and atria, left and right ventriclesright ventricles

Components:Components:b.b. BloodBlood-- Red blood cells (rbc): Red blood cells (rbc):

oxygen richoxygen rich White blood cells (wbc): White blood cells (wbc):

disease fighting cellsdisease fighting cells Platelets: blood clottingPlatelets: blood clotting Plasma: a yellowish Plasma: a yellowish

liquid that contains liquid that contains platelets, rbc, wbc, waste platelets, rbc, wbc, waste products and other products and other substancessubstances

Components:Components:c. c. Blood vessels-Blood vessels- Arteries: carry blood Arteries: carry blood

away from heart; have away from heart; have thick walls to withstand thick walls to withstand pressure from the heartpressure from the heart

Veins: carry blood Veins: carry blood towards heart; have towards heart; have one-way valves to one-way valves to prevent blood from prevent blood from flowing backflowing back

Components:Components:c. c. Blood vessels-Blood vessels- Capillaries: link arteries and veins; thin Capillaries: link arteries and veins; thin

enough to allow diffusion of oxygen and enough to allow diffusion of oxygen and nutrient; 10 vessels side by side equal the nutrient; 10 vessels side by side equal the size of a human hairsize of a human hair

Cardiovascular Diseases:Cardiovascular Diseases:

a. a. AtherosclerosisAtherosclerosis – plaque in the – plaque in the artery walls artery walls reduces blood flow; reduces blood flow; caused by high caused by high cholesterolcholesterol

Cardiovascular Diseases:Cardiovascular Diseases:

b. b. HypertensionHypertension- elevated - elevated blood pressure resulting blood pressure resulting from an increase in the from an increase in the amount of blood or due amount of blood or due to blood pushing through to blood pushing through narrow openings; after narrow openings; after some time heart thickenssome time heart thickens

Cardiovascular Diseases:Cardiovascular Diseases:

c.c.ArteriosclerosisArteriosclerosis- - hardening of the hardening of the arteries; loss of arteries; loss of arterial elasticity; arterial elasticity; impairs circulation; impairs circulation; heart has to work heart has to work harder to deliver harder to deliver bloodblood