1. 3.4 Circulatory System

2. Circulatory System Transport substances around the body
Carries nutrients from the i cells
delivers oxygen from the lungs
carries carbon dioxide to the lungs
Blood carries waste from body

3. Circulatory System 3 necessary components: Blood (fluid) Heart (pump)
Blood vessels (arteries and veins)

4. Blood Connective tissue about 5L Mostly Red Blood Cells
Contain hemoglobin which carries the oxygen
Produced in the bone marrow
Lack a nucleus

5. Blood White blood cells Leukocytes Produced by bone marrow
Fight infections by destroying invading bacteria/viruses
<1% of the blood volume
Have a nucleus

6. Blood
Platelets
Assist in blood clotting
<1% of blood volume

7. Blood
Plasma (mostly water)
Protein-rich liquid
Half of blood’s volume

8. Heart 4 chambers right side pumps to the lungs
Left side pumps to the rest of the body

9. Heart - Anatomy

10. Blood Vessels Network of tubes throughout the body to transport blood
Arteries
Carry blood AWAY from the heart
Largest – Aorta
Smallest – arterioles
Contain elastic connective tissue and muscle

11. Blood Vessels Veins Carry blood BACK TO the heart
Receive blood from capillaries
Largest – Superior/inferior vena cava
Smallest – venules
Contain muscle, connective tissue, and valves
Valves prevent backflow

12. Blood Vessels Capillaries microscopic vessels, one cell thick
the place where substance get into or out the circulatory system
Bridge between arteries and veins

14. Homework
P 87 # 3, 4, 9
Circulatory CROSSWORD