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SCIENCE EXAM STUDY GUIDE
MVP circulatory system
20
Science
6th Grade
06/02/2007

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Term
cardiovascular system
Definition
consists of heart, b-vessels, and blood. carries needed substances to cells and carries waste products away from cells (AKA circulatory system)
Term
pacemaker
Definition
a group of heart cells that send out signals that make the heart muscle contract. located in right atrium of heart
Term
blood pressure
Definition
the pressure that is exerted by the blood against the walls of b-vessels
Term
platelet
Definition
a cell fragment that plays an important part in forming blood clots
Term
valve
Definition
a flap of tissue that prevents blood from flowing backward. located b/w the ventricles and the large b-vessels that carry blood away from the heart
Term
aorta
Definition
the largest artery in the body
Term
plasma
Definition
the liquid part of blood
Term
coronary artery
Definition
an artery that supplies blood to the heart itself
Term
pulse
Definition
the alternating expansion and relaxation of an artery wall as blood travels through an artery
Term
hemoglobin
Definition
an iron containing protein that binds chemically to oxygen molecules. makes up most of red b-cells
Term
vein
Definition
a blood vessel that carries blood back to the heart
Term
capillary
Definition
tiny, narrow vessels where substances are exchanged b/w the blood and body cells
Term
artery
Definition
a blood vessel that carries blood away from the heart
Term
functions of the cardiovascular system
Definition
1. delivering needed materials 2. removing waste products 3. fighting diseases
Term
describe the heart
Definition
located in center of chest. size of fist
Term
how heart works
Definition
each time the heart beats, it pushes blood through the b-vessels of the cardiovascular system
Term
calculate pulse rate
Definition
# of heartbeats/ time
Term
differences b/w veins, capillaries, and arteries
Definition
capillaraies: 1 cell thick, materials are exchanged b/w body and b-cells........ arteries: 3 cell layers....caries blood away from heart.......veins: large...3 cell layers..... carries blood to heart
Term
blood types 1 can safely rec'v in blood transfusion
Definition
A: a,o B: b,o AB: a,b,ab,o O: o
Term
function of lymphatic system and lymph nodes
Definition
system: netwokr of veinlike vessels that returns the fluid to the bloodstream nodes: filter lymph, trapping bacteria and other disease-causing microorganisms in the fluid
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