Circulatory System Notes
Textbook Online

Class Notes

Function: To move and circulate blood.

Transports material (nutrients and oxygen) to and from cells

Protection of the body by white blood cells

Regulation of body temperature


Blood-:plasma-liquid of blood 92% water and 8% protien

Platelets- small cells that help the blood to clot.

Release fibers to work with protien to create blood clots,

Which form plugs to help reduce blood loss.

RBC- red blood cells- most abundant. Hemoglobin, red color.

transport oxygen. Bright red with O2 and purple without O2.

Made in bone marrow.

WBC- defends against disease.

Eats parts of dead cells.

Arteries: large blood vessels that carry oxygenated blood.

From the heart to the body. Thick and elastic

Veins: Blood vessels that carry deoxygenated blood.

From the body  to the heart.

Capillaries: Tiny blood vessels that absorb food and oxygen to feed

RBC and get rid of CO2 and waste.

Connect arteries to Veins.


Heart: A musclar pump that moves the blood throughout the body.

Four chambers: atrium-upper chambers

ventricle- lower chamber

Valves between to keep blood going one direction.

Muscles: Cardium- wall of the heart. 3 layers

Pericardium- surronds the heart. 2 layers.

The right artium taks blood in from the body, through the inferior

and superior vena cava’s. It then goes into the right ventricle, through, the pulmonary artery to the lung. When the blood enters the heart again it enters the left artium and then through the bicuspid valve into the left ventricle. The left ventricle pumps the blood through the aorta to the body for the process to happen again.  

Prentice-Hall Virtual Heart



W.T. Eich Intermediate