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Capillaries
Circulatory systems that bathe the cells in blood.
Nutrients
What is dropped off at the cells in the body tissue.
Hemoglobin
The protein in blood that binds to oxygen.
Trachea
A cartilaginous tube that connects the larynx to the bronchi in the lungs.
Smoking
A habit that can severely damage your lungs and severely shorten your life.
Respiration
Gas exchange in which oxygen is brought in and carbon dioxide is released.
Platelets
Blood cells that help with clotting.
Valves
Veins have valves to prevent the backflow of blood.
Circulatory
Circulatory system provides oxygen, nutrients, and eliminates wastes for larger organisms.
Plaques
Build-ups in the walls of the arteries that cause atherosclerosis.
Murmur
A defect in a heart valve.
Gravity
The biggest problem for the circulatory system of a giraffe.
Systolic
The upper pressure in a blood pressure reading.
Warm
In cold environments, nostrils also help warm the air before it enters the lungs.
Increased
Capillaries have increased surface area compared to arteries.
Arteries
Vessels that move blood away from the heart.
Stroke
Damage to brain tissue due to blocked or ruptured arteries.
Two
Gas exchange occurs in two phases.
Larynx
The vocal cords are contained in the larynx.
Gills
Gas exchange system used by some aquatic organisms such as fish.
Dead air
The air left in the lungs after exhalation is called dead air.
Diastolic
Portion of the heart cycle where the heart is relaxed.
White
White blood cells help fight infection.
Closed
Circulatory system where blood travels in vessels.
Iron
The element in hemoglobin that oxygen binds to.
Copper
The blood of arthropods has copper instead of iron.
Double
Four-chambered hearts use a double circulatory system in which 2 circuits flow.
Leukemia
Cancer of the blood.
Alveoli
The most important organs of the respiratory system that remove oxygen from air.
Veins
Vessels that move blood to the heart.
Left atrium
The chamber in which blood is received from the lungs.
Countercurrent
In the gills, a countercurrent exchange system passes blood in one direction next to water flowing in the opposite direction.
Coronary
The arteries that feed the heart muscle itself.
Gravity
Blood is helped to move back up the legs by gravity.
Sanode
The natural built-in pacemaker for the heart.
Blood pressure
The force blood exerts on the vessel walls.
Cardiac output
Amount of blood pumped by the heart per minute.
Air
Which of the following contains more oxygen:air or water?
Left ventricle
The ventricle in the human heart that pumps blood to the entire body.
Hypertension
High blood pressure is also known as hypertension.
Inhalation
The diaphragm moves down during this process, and air comes into the lungs.
Ventricle
A heart chamber that pumps blood out.
Oxygen
The brain automatically responds to the level of oxygen in the blood.
Heart attack
Damage to the heart muscle.
Capillaries
Small vessels in which only one red blood cell can move at a time.
Red
Red blood cells carry carbon dioxide and wastes away from the cells.
Exhalation
The diaphragm moves up during this process, and air leaves the lungs.
Open
Very small simple organisms with one or two tissue layers use open circulation instead of circulation.
Right atrium
A heart chamber that receives blood from the rest of the body.
Lowest
Blood pressure is highest or lowest in the veins?
Mucus
Hair and mucus in the nostrils provide protection for the respiratory system.
Note 
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