Presentation on theme: "C IRCULATORY S YSTEM Life function: Transport- The process by which materials such as(nutrients,O 2,CO 2,waste, hormones and immune factors) are moved."— Presentation transcript:
C IRCULATORY S YSTEM Life function: Transport- The process by which materials such as(nutrients,O 2,CO 2,waste, hormones and immune factors) are moved between cells=circulatory system
T HINK P AIR S HARE We just finished digestion. What is the relationship between digestion and transport? Digested materials enter the bloodstream through the villi in the small intestine.
T RANSPORT AND C IRCULATION In order for material to enter cells and move between cells, a transport system is needed. This system is called the circulatory system.
H UMAN HAVE A CLOSED CIRCULATORY SYSTEM Includes 3 parts 1) A fluid (blood)to carry material. 2) A network (system) of tubes (blood vessels) to carry fluid. 3) A pump (heart) to push fluid along.
W HILE OTHER O RGANISM ’ S HAVE AN OPEN CIRCULATORY SYSTEM The fluid flows freely throughout the body and is not contained in tubes.
B LOOD V ESSELS 3 kinds of vessels=arteries, veins, capillaries. All together the vessels are thousands of kilometers long. Carry blood through heart, lungs and body.
A RTERIES Have thick muscular walls that expand and contract as blood is pumped. This accounts for your pulse.
A RTERIES Carry blood away from the heart to the organs of the body. Elasticity of the walls exert pressure on the blood inside =blood pressure. Can be blocked with fatty deposits. Large arteries branch, forming smaller vessels eventually dividing into arterioles (small arteries) and then capillaries.