The graph shows changes in blood pressure during one cardiac cycle, what is happening to the ventricle and aortic semilunar valve at point X?

• Ventricles contracting, aortic semilunar valve closing

• ventricle contracting, aoritic semilunar valve opening

• ventricle relaxing, aortic semilunar valve opening

• ventricle relaxing, aortic semilunar valve opening

Tags

NGSS.HS-LS1-3

Which of the following statements best explains the changes in blood pressure occurring within the ventricle at that point X?

• the ventricles is contracting

• the ventricle is relaxing

• the atrioventricular valve is open

• blood is leaving the ventricle

Tags

NGSS.HS-LS1-3

Why is the pressure in the ventricle and aorta almost equal during ventricular systole?

• because the ventricle recieves blood directly from the aorta

• because the pressure with which blood leaves the ventricle is the pressure with which it enters the aorta

• because the semilunar valve between the ventricle and aorta is open

• because the atrioventricular valve is closed

Using the graph, at which point does the atrioventricular valve open?

• A

• B

• C

• D

At which point is the pressure in the atria greater than pressure in the ventricles?

• after point A

• after point B

• after point C

• after point D

At which point is pressure in the ventricles greater than pressure in the atria?

• after point A

• after point B

• after point C

• after point D

The chart shows two cardiac cycles of a student, with the sequence of events set against a time scale. How many times does the students heart beat in 3 minutes?

• 80

• 240

• 120

• 360

The diagram shows the pressure changes in various structures of the left side of the heart during the cardiac cycle. At the end of which period, A, B, C or D is the ventricle full of blood?

• A

• B

• C

• D

With reference to the graph, which of the following statement is true?

• Blood is moving out of the ventricles during period A

• The ventricles are full of blood throughout period B

• Blood is moving out of the ventricles during period C

• The ventricle is completely empty during period D

Using the graph, which line is represented by X and Y?

• X: pressure changes in the aorta, Y: pressure changes in the ventricle

• X: pressure changes in the ventricle, Y: pressure changes in the aorta

• X: volume changes in the ventricle, Y: volume changes in the aorta

• X: volume changes in the aorta, Y: volume changes in the ventricle