Circulatory System

The Circulatory System (4 min)*Student Learning Target:

I can identify the general function and major organs of the circulatory system. I can explain how the circulatory system helps to maintain the homeostasis of the organism.

*Aim:How does the circulatory system help us to maintain homeostasis?

What is it for?What does our

circulatory system do?

Circulatory System* (3 min)Circulatory System – def: organ system that

is responsible of the delivery of materials throughout the body

Includes:Blood/blood vesselsLymph/lymph vesselsHeart

Blood* (4 min)Blood – a tissue composed of:

Plasma –helps blood transportRed blood cells – round, disk shaped cells

containing hemoglobin (iron molecule that carries oxygen)

White blood cells – produced in lymph tissue and bone marrow, fight infections

Platelets – involved in blood clotting

Blood Vessels* (4 min)Arteries – carry blood away from the heart

Thick elastic artery wallsAorta – largest artery in body

Capillaries – connect arteries to veins, area of nutrient/gas exchange between blood and body cellsThin walls

Veins – carry blood back to heartThin walls, one way valves

Pulmonary – having to do with the lungs

Arteries – Capillaries - Veins

The Heart* (6 min)Veins - (oxygen poor

blood)

Right atriumRight ventriclePulmonary arteryLungs (oxygen rich

blood)

Pulmonary veinsLeft atriumLeft ventricleAorta (out to body)

Circulation and Homeostasis (3 min)How does the circulatory system help us

maintain HOMEOSTASIS?

Circulates and delivers materialsTransport oxygen and wasteWater transportTemperature regulation