What is the main organ of the circulatory system?
Heart
What are the two main types of circulatory systems?
Open circulatory system and closed circulatory system
What is an open circulatory system?
In an open circulatory system, blood is not always contained within vessels and flows freely through cavities.
What is a closed circulatory system?
In a closed circulatory system, blood is contained within vessels at all times.
What is a single circulatory system?
In a single circulatory system, blood passes through the heart only once during each cycle of circulation (e.g., in fish).
What is a double circulatory system?
In a double circulatory system, blood passes through the heart twice during each cycle (e.g., in mammals and birds).
What are the two circuits of the double circulatory system?
The pulmonary circuit and the systemic circuit.
What is the pulmonary circuit?
The pulmonary circuit carries deoxygenated blood from the heart to the lungs for oxygenation and back to the heart.
What is the systemic circuit?
The systemic circuit carries oxygenated blood from the heart to the rest of the body and returns deoxygenated blood to the heart.
What vessels carry blood away from the heart?
Arteries
What vessels carry blood back to the heart?
Veins
What tiny blood vessels facilitate the exchange of oxygen and nutrients with tissues?
Capillaries
What part of the heart pumps oxygenated blood to the body?
Left ventricle
What part of the heart pumps deoxygenated blood to the lungs?
Right ventricle
What structure prevents blood from flowing backward in veins?
Valves
What is the largest artery in the body?
Aorta
What is the largest vein in the body?
Vena cava
What is the oxygen-carrying protein found in red blood cells?
Hemoglobin
What blood cells help in clotting?
Platelets
What is the average resting heart rate for adults?
60-100 beats per minute
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