CIRCULATORY SYSTEM

by d. jones

BLOOD VESSELS

STANDARD

students know:

how the complementary activity of major body systems provides cells with oxygen and nutrients, and removes toxic waste products such as carbon dioxide.

ESLR: Complex Thinker

By the end of this program you should be able to compare and contrast the structure and function of each type of blood vessel.

You should know the structure and function of the components of blood.

ARTERIES

carry blood from the heart

round

thick, elastic walls

high pressure

BLOOD PRESSURE

Measured using sphygmomanometer

systolic pressurehighest pressure

caused by ventricles contracting

diastolic pressurelowest pressure

caused by ventricles relaxing

reported as systolic pressure/diastolic pressure ( normal =110/80)

VEINS

carry blood to heart

oval

not as thick or elastic as arteries

have valves

CAPILLARIES

exchange materialsoxygen/carbon dioxide

nutrients/waste

one cell layer thick

DISORDERS

heart attackblocked coronary artery• cells die because of lack of oxygen & nutrients

strokeblocked or broken blood vessel in brain• cells die because of lack of oxygen & nutrients

atherosclerosis (hardening of the arteries)plaques form in the arteries• arteries are narrowed• blood pressure increases

hypertension (high blood pressure)blood pressure is continuously high

causes vary• stress• obesity• high salt intake• smoking

varicose veinsweak valves

blood pools above good valve