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WorksheetsIB Biology SL - The Heart
Total questions: 10
Worksheet time: 5mins
What type of muscle is found in the heart?
skeletal
smooth
voluntary
cardiac
In general, what is systole?
contraction
the same as diastole
relaxation
the system of blood vessels in the heart
What causes the "lub" sound?
AV valves closing
AV valves opening
semilunar valves closing
semilunar valves opening
What chamber of the heart has the thickest walls?
right atrium
left atrium
right ventricle
left ventricle
The human heart is referred to as myogenic because
nerve impulses stimulate the heart muscle tissue to contract
an individual has an SA node that is not functioning
a signal originates within the heart muscle tissue to contract
the size of the heart is genetically determined based on the myocyte gene
The two causes of normal heart sounds are
AV valves closing and semilunar valves opening
AV valves opening and semilunar valves closing
AV valves closing and semilunar valves closing
AV valves opening and semilunar valves opening
The diagram shows the pressure changes during a cardiac cycle. Which is an explanation of what is happening?
During phase I, pressure in the left ventricle decreases while it increases in the aorta during contraction of the left atrium
In phase II , pressure rises in the aorta because the left ventricle is contracting
In phase III, pressure decreases in the aorta because the left atrium is relaxing
In phase III, there is a constant increase of pressure in the aorta as both the left atrium and ventricle are at rest
A
B
C
D
In which blood vessels connected to the heart does the blood have the lowest carbon dioxide concentration?
Pulmonary vein
Vena cava
Pulmonary artery
Coronary vein
The picture shows a human heart. Which shows the sequence of blood flow through the heart?
III ----> IV ----> I
IV ----> III ----> II
VII ----> VIII ----> I
VIII ----> VII ----> VI
