IB BIO 6.2 - The Heart

When the left ventricle is relaxed, what is the state of the valves?

• A

• B

• C

• D

An individual was presented with a stimulus resulting in the release of epinephrine. What was the most likely nature of the stimulus?

• A. Sunset and the onset of darkness

• B. An image of a close friend

• C. The intake of glucose

• D. A coach shouting to begin physical activity

Tags

NGSS.HS-LS1-3

What is a property of arteries?

• A. Arteries have elastic walls.

• B. Arteries have valves.

• C. All arteries carry oxygenated blood.

• D. Arteries receive blood from the atria.

When intense physical activity is anticipated, which factor in the blood will increase the frequency of sinoatrial signals to heart muscle?

• A. pH

• B. Oxygen level

• C. Thyroxin

• D. Epinephrine

Tags

NGSS.HS-LS1-3

What causes heart ventricles to fill with blood?

I. Atrial contraction

II. Closing of atrioventricular valves

III. Opening of semilunar valves

• A. I only

• B. I and II only

• C. II and III only

• D. III only

Which discovery was an indication that the heart pumps blood to the body through arteries?

• A. The amount of blood pumped exceeds that of blood produced

• B. Blood could easily be pushed up a limb vein, but not down

• C. The observation that there were pores between the right and left atria

• D. The heart swelled up when the arteries were tied in an animal experiment

What is the position of heart valves when blood pressure is highest in the aorta?

• A

• B

• C

• D

In which blood vessel connected to the heart does blood have the lowest carbon dioxide concentration?

• A. Pulmonary vein

• B. Vena cava

• C. Pulmonary artery

• D. Coronary vein

What is a feature of the left atrium?

• A. Epinephrine decreases its rate of contraction.

• B. It contracts as the left ventricle contracts.

• C. It receives blood from the left pulmonary artery.

• D. Its pressure decreases as the left ventricle fills up.

What blood flow does the right semilunar valve prevent?

• A. Backflow of blood to the right atrium during ventricular contraction

• B. Blood flowing from the aorta back into the heart when the ventricle is filling

• C. Blood flowing from the pulmonary artery to the right ventricle when the heart is relaxing

• D. Blood flowing from the right atrium to the vena cava when the right atrium contracts