Circulatory System Flashcards
Open vs Closed circulatory system
Open:Blood is not entirely contained in the blood vessels. Blood is pumped by a tubular heart into blood vessels and spongy chambers called sinuses.
Closed: Blood remains within blood vessels, nutrients, waste and O2 move in and out through the thin walls of the smallest blood vessels. More efficient circulation.
Other name for circulatory system?
Cardiovascular system
What are the 2 types of circulatory systems?
Open and Closed
Function of the circulatory system?
Supplies trillions of cells with water, nutrients and O2 and removes CO2 and other wastes, it regulates body temp., helps heal wounds and fight infection.
How much blood do you contain?
4 to 6 L
What is blood made of?
Liquid: Plasma
Solid: RBC, WBC (leukocytes), Platelets
Plasma
55% of blood is plasma and 90% of plasma is water
Helps regulate body temp. The remaining 10% is protein, nutrients and wastes such as CO2. Plasma proteins transport fatty acids and vitamins and fight infections.
RBC
45% of blood is mostly RBC. RBC carries O2 from lungs to all the tissues of the body. 1mm cubed contains about 5 million RBCs. Every RBC contains about 250 million molecules of hemoglobin. Once O2 s gone, Rbc carries CO2 to the lungs.
Hemoglobin
A protein that binds O2 in the lungs and releases it throughout the body.
Why is blood red?
O2 binds to the iron portion of hemoglobin.
Where are RBC produced?
Bone Marrow. Produced at 2 million/1s in a healthy adult.
What is the advantage of the shape of RBC?
It’s inward curve in the middle, caused by the loss of the nuclei and mitochondria, increases the SA. Also gives flexibility to pass through blood vessels of differnet shapes and sizes.
Life of RBC?
Lifespan: 100-120 days
Is broken down and the iron from the old blood cell is returned to bone marrow to produce new RBC.
WBC function?
Fight infection, bacteria and parasites. They can move outside of the blood vessels when they are needed to fight foreign bodies.
Quantity of WBC?
Around 4 000 and 11 000 WBC in 1mm cubed, except when fighting infections, then the amount dramatically increases.
