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 vessels Lymph/lymph vessels Heart

Blood* (4 min) Blood – a tissue composed of: Plasma –helps blood transport Red 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 walls Aorta – largest artery in body Capillaries – connect arteries to veins, area of nutrient/gas exchange between blood and body cells Thin walls Veins – carry blood back to heart Thin walls, one way valves Pulmonary – having to do with the lungs

Arteries – Capillaries - Veins

The Heart* (6 min) Veins - (oxygen poor blood) Right atrium Right ventricle Pulmonary artery Lungs (oxygen rich blood) Pulmonary veins Left atrium Left ventricle Aorta (out to body)

Circulation and Homeostasis (3 min) How does the circulatory system help us maintain HOMEOSTASIS? Circulates and delivers materials Transport oxygen and waste Water transport Temperature regulation