20 flashcards · Shared on 19 August 2026 by AtomAI Library
Flip each card to check yourself.
What is the main function of the circulatory system?
To transport substances around the body
What is the main function of the circulatory system?
To transport substances around the body
Which chamber receives deoxygenated blood returning from the body?
Right atrium
Which chamber pumps deoxygenated blood toward the lungs?
Right ventricle
Oxygenated blood from the lungs enters which chamber of the heart?
Left atrium
Why does the left ventricle have a thicker muscular wall than the right ventricle?
It pumps blood at higher pressure around the whole body
What is the function of the valves in the heart?
To prevent the backward flow of blood
Which valve lies between the right atrium and the right ventricle?
Tricuspid valve
Which sequence correctly traces blood from the body toward the lungs?
Vena cava → right atrium → right ventricle → pulmonary artery
How is an artery defined?
A vessel that carries blood away from the heart
What feature of many veins helps blood return to the heart?
Internal valves that prevent backflow
Why are capillary walls only one cell thick?
To allow rapid exchange between blood and tissues
Which statement about the pulmonary artery is correct?
It carries deoxygenated blood from the heart to the lungs
What does the pulmonary vein carry?
Oxygenated blood from the lungs to the heart
What is the main role of red blood cells?
To transport oxygen using haemoglobin
Which blood component is mainly responsible for clotting?
Platelets
What is plasma?
The liquid part of blood that carries cells and dissolved substances
Which vessels supply the heart muscle itself with oxygenated blood?
Coronary arteries
What is systole in the cardiac cycle?
The phase in which heart muscle contracts
What is the role of the septum in the heart?
It prevents mixing between the left and right sides
Which structure normally initiates each heartbeat?
Sinoatrial node