7th Grde Life Science – Fabish

Question Answer
What does the Cardiovascular system do? Transports materials to and from your cells
What are the three parts of the Cardiovascular system? Heart, blood, blood vessels
What does blood consist of? cells, cell parts and plasma
What are the two types of blood cells? Red blood cells and white blood cells
Which cells are the most abundant in the body? Red blood cells
Why are red blood cells red? They contain iron (Fe) which bonds to oxygen (O2). FeO2(ferrous oxide – rust) produces the red color.
Why do red blood cells have a concave (dented in) shape? This shape gives them more surface area, and allows them to transport more oxygen.
What is the material found in red blood cells that transports oxygen called? hemoglobin
Where are both red and white blood cells made? In the bone marrow
What are the jobs of the white blood cells? 1. engulf pathogens 2. release antibodies that destroy pathogens 3. engulf and dispose of dead or damaged body cells
What are pathogens? bacteria, viruses and other microscopic particles that make you sick
When RBC's are lacking in iron (Fe) what will not be as readily transported by the blood? Oxygen
What are platelets? Small particles within the blood that clump together to cause clotting
What is the main job of the heart? It pumps oxygen-poor blood to the lungs, and oxygen-rich blood to the body
How big is the heart muscle? About the size of your fist
The upper chambers of the heart are called: The right and left atria (atrium is singular)
The lower chambers of the heart are called: The right and left ventricles
What are located between the atria and ventricles? Valves which control the flow and direction of the blood
Define blood vessels Hollow tubes that transport blood
Where does blood from the body or the lungs enter the heart? The atria
What part of the heart pushes blood out to the body or the lungs? The ventricles
Which side of the heart receives blood low in O2 and high in CO2? The right side
Which side of the heart receives blood high in O2 and high in CO2? The left side
Blood vessels that direct blood to the HEART: veins
Blood vessels that direct blood to the BODY: arteries
Which blood vessels are thicker and why? Arteries are thicker, because it takes more pressure to move the blood through the entire body than to return it to the heart.
What are the smallest blood vessels called? Capillaries
Why do capillaries not bleed much when they are cut? They are so small, blood must pass one cell at a time, making clotting easier.
What causes "blood pressure"? The force of blood exerted on the inside walls of the blood vessels.
What blood pressure is considered "normal"?
What is systolic pressure? Pressure created inside large arteries when the ventricles contract. This is the "top" or first number in the blood pressure.
What is diastolic pressure? Pressure inside arteries when the ventricles are relaxed. This is the "bottom" or second number in a blood pressure
What do we call the chemicals that are sometimes present on the surface of RBC's? Antigens
What are the chemicals that bind to antigens not found on their RBC's? Antibodies
Which type of blood has A antigens and B antibodies? Type A
Which type of blood has B antigens and A antibodies? Type B
Which type of blood has AB antigens and no antibodies? Type AB
Which type of blood has NO antigens and AB antibodies? Type O
Which type of blood is the universal donor, and why? Type O, because it carries no antigens, and as a donor, will not be attacked by antibodies
Which type of blood is the universal recipient, and why? Type AB, because it produces no antibodies, and will not attack other types of donor blood.
This word means that heart muscle cell can stimulate themselves. Self-excitatory