Transcript Unit One: Homeostasis and Immunity

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