A Level Biology: The Cardiac Cycle(Completely solved)
Name the three main stages of the cardiac cycle in order correct answersatrial systole, ventricle
systole, diastole
Describe atrial systole correct answersthe atria contract, creating a small increase in pressure,
pushing blood into the ventricles
Describe ventricular systole correct answersthe ventricles contract at the base of the heart,
pumping blood upwards towards the arteries
Describe diastole correct answersthe muscular walls of all four chambers relax and elastic recoil
allows the chambers to increase in volume so blood can flow in through the veins
What is the key function of valves in the heat? correct answersthe ensure blood flows in the right
direction
Where are the atria-ventricular valves located? correct answersbetween the atrium and ventricle
Describe the opening of atria-ventricular valves correct answerswhen the ventricular walls relax,
the pressure in the ventricles drop below the pressure in the atria- the blood in the atria pushes
the atria-ventricular valves open
Describe the closing of the atria-ventricular valves correct answersafter the atria-ventricular
valve opens, blood enters the atria and ventricles, causing pressure to slowly rise. When the
ventricle is full, a swirling action around the valve causes it to close
Where are the semilunar valves located? correct answersbetween the atria and the arteries
Name the two arteries of the heart correct answersaorta and pulmonary artery
Name the two veins of the heart correct answersvena cava and pulmonary vein
Describe the closing of the semilunar valves correct answersbefore ventricular systole, the
pressure in the arteries is higher than the pressure in the ventricles, causing the semilunar valves
to be closed
Describe the opening of the semilunar valves correct answerswhen ventricular systole takes
place, the pressure in the ventricle exceeds the pressure in the arteries, causing the semilunar
valves to be pushed open
Name the three main stages of the cardiac cycle in order correct answersatrial systole, ventricle
systole, diastole
Describe atrial systole correct answersthe atria contract, creating a small increase in pressure,
pushing blood into the ventricles
Describe ventricular systole correct answersthe ventricles contract at the base of the heart,
pumping blood upwards towards the arteries
Describe diastole correct answersthe muscular walls of all four chambers relax and elastic recoil
allows the chambers to increase in volume so blood can flow in through the veins
What is the key function of valves in the heat? correct answersthe ensure blood flows in the right
direction
Where are the atria-ventricular valves located? correct answersbetween the atrium and ventricle
Describe the opening of atria-ventricular valves correct answerswhen the ventricular walls relax,
the pressure in the ventricles drop below the pressure in the atria- the blood in the atria pushes
the atria-ventricular valves open
Describe the closing of the atria-ventricular valves correct answersafter the atria-ventricular
valve opens, blood enters the atria and ventricles, causing pressure to slowly rise. When the
ventricle is full, a swirling action around the valve causes it to close
Where are the semilunar valves located? correct answersbetween the atria and the arteries
Name the two arteries of the heart correct answersaorta and pulmonary artery
Name the two veins of the heart correct answersvena cava and pulmonary vein
Describe the closing of the semilunar valves correct answersbefore ventricular systole, the
pressure in the arteries is higher than the pressure in the ventricles, causing the semilunar valves
to be closed
Describe the opening of the semilunar valves correct answerswhen ventricular systole takes
place, the pressure in the ventricle exceeds the pressure in the arteries, causing the semilunar
valves to be pushed open
