Cardiovascular System.

The heart contracts twice for every heartbeat. One contraction is the atrial contraction while the other is the ventricular contraction. During ventricular contraction, which two valves of the heart open?

• Pulmonary and aortic valves

• Aortic and mitral valves

• Aortic and tricuspid valves

• Pulmonary and tricuspid valves

• The arterioles at the surface of her skin can vasoconstrict so more heat leaves her body.

• The arterioles at the surface of her skin can vasoconstrict so less heat leaves her body.

• The arterioles at the surface of her skin can vasodilate so less heat leaves her body.

• The arterioles at the surface of her skin can vasodilate so more heat leaves her body.

Heart rate is described as the number of heart beats per minute. The normal human heart rate ranges from 60-100 beats per minute (bpm). Lance Armstrong (pictured above) had a resting heart rate of 32 beats per minute. While racing, his heart rate would increase to 1.6 beats per second. How many more bpm was his heart rate while racing than while resting?

• 64bpm

• 32bpm

• 85bpm

• 46bpm

Select the correct names for Structure B.

• Aortic Valve.

• Tricuspid Valve.

• Pulmonary Valve.

• Septum.

Letter C represents a structure found in which type of circulation.

• Pulmonary.

• Systemic.