18 Questions
During atrial systole, what happens to the pressure in the ventricles?
It increases.
What is responsible for creating the pulse in the circulatory system?
Pressure waves from the semilunar valves closing.
Which structure acts as the 'pacemaker' of the heart and sets the rhythm of the heartbeat?
Sino-atrial node
What happens to artery pressure compared to ventricle pressure during ventricular systole?
Ventricle pressure is greater than artery pressure.
Which phase of the cardiac cycle involves the closure of the AV valves?
Atrial systole
How does cardiac output relate to heart rate and stroke volume?
Cardiac output depends on heart rate and stroke volume.
What prevents the atrioventricular valves from turning inside out when the ventricle walls contract?
Tendinous cords
Where does the deoxygenated blood enter after passing through the tricuspid valves?
Pulmonary artery
Which blood vessels supply oxygenated blood to the heart muscle?
Coronary arteries
What is the function of intercalated discs in muscle cells?
Synchronize contraction
Where does the blood move after being pumped out of the left ventricle?
Aorta
What is the purpose of semilunar valves in the heart?
Prevent blood backflow into ventricles
What is the main function of the atrioventricular node (AVN) in the cardiac cycle?
Passing waves of electrical activity from the atria to the Bundle of His
Which part of the heart is responsible for conducting waves of electrical activity to the Purkyne tissue?
Bundle of His
What does the T wave represent in an ECG trace?
Repolarization of the ventricles
Which condition is characterized by an extremely irregular heartbeat, potentially causing chest pain and fainting?
Fibrillation
What is the role of haemoglobin in blood circulation?
Transporting oxygen and carbon dioxide
How does tachycardia differ from bradycardia?
Bradycardia is a condition where the heart beats too fast, while tachycardia is when it beats too slow.
Test your knowledge on the anatomy of cardiac muscle, including the arrangement of mitochondria, myofibrils, intercalated discs, sacromeres, coronary arteries, ventricles, atria, vena cava, pulmonary vein, Atrio-ventricular valves, and tendinous cords.
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