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9 Cards in this Set

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BLOOD
The Blood
The blood is an amazing substance that is constantly flowing through our bodies.
• Your blood is pumped by your heart.
• Your blood travels through thousands of miles of blood vessels right within your own body.
• Your blood carries nutrients, water, oxygen and waste products to and from your body cells.
• A young person has about a gallon of blood. An adult has about 5 quarts.
• Your blood is not just a red liquid but rather is made up of liquids, solids and small amounts of oxygen and carbon dioxide.
RED AND WHITE BLOOD CELLS
Red Blood Cells
Red Blood Cells are responsible for carrying oxygen and carbon dioxide. Red Blood Cells pick up oxygen in the lungs and transport it to all the body cells. After delivering the oxygen to the cells it gathers up the carbon dioxide(a waste gas produced as our cells are working) and transports carbon dioxide back to the lungs where it is removed from the body when we exhale(breath out). There are about 5,000,000 Red Blood Cells in ONE drop of blood.
White Blood Cells (Germinators)
White Blood Cells help the body fight off germs. White Blood Cells attack and destroy germs when they enter the body. When you have an infection your body will produce more White Blood Cells to help fight an infection. Sometimes our White Blood Cells need a little help and the Doctor will prescribe an antibiotic to help our White Blood Cells fight a large scale infection.
PLATELETS AND PLASMA
Platelets
Platelets are blood cells that help stop bleeding. When we cut ourselves we have broken a blood vessel and the blood leaks out. In order to plug up the holes where the blood is leaking from the platelets start to stick to the opening of the damaged blood vessels. As the platelets stick to the opening of the damaged vessel they attract more platelets, fibers and other blood cells to help form a plug to seal the broken blood vessel. When the platelet plug is completely formed the wound stops bleeding. We call our platelet plugs scabs.
Plasma
Plasma is the liquid part of the blood. Approximately half of your blood is made of plasma. The plasma carries the blood cells and other components throughout the body. Plasma is made in the liver.
wHAT ARE BLOOD CELLS MADE OF?
Where are the blood cells made?
The Red Blood Cells, White Blood Cells and Platelets are made by the bone marrow. Bone marrow is a soft tissue inside of our bones that produces blood cells.
BLOOD VESSELS
The Blood Vessels
In class we talked about three types of blood vessels:
1. Arteries
2. Capillaries
3. Veins
ARTERIES
Arteries
Arteries are blood vessels that carry oxygen rich blood AWAY from the heart. Remember, A A Arteries Away, A A Arteries Away, A A Arteries Away.
CAPILLARIES
Capillaries
Capillaries are tiny blood vessels as thin or thinner than the hairs on your head. Capillaries connect arteries to veins. Food substances(nutrients), oxygen and wastes pass in and out of your blood through the capillary walls.
VEINS
Veins
Veins carry blood back toward your heart.
VIENS AND BLOOD VESSELS WALLS
5. With the exception of Capillaries and tiny Veins, Blood Vessels have WALLS made of THREE LAYERS OF TISSUE, that provides for a combination of Strength and Elasticity: (Figure 46-4)
A. THE INNER LAYER IS EPITHELIAL TISSUE.
B. THE MIDDLE LAYER IS SMOOTH MUSCLE TISSUE.
C. THE OUTER LAYER IS CONNECTIVE TISSUE