IB Bio Topic 6

What happens to starch in the small intestine?

• Endopeptidase, secreted by the liver digests starch to enable absorption by the villi

• Contraction of the intestinal muscles mixes starch with enzymes to accelerate its conversion into amylose

• Glycogen secreted by the pancreas hydrolyses starch into glucose, which is eventually transported to the liver

• Amylase secreted by the pancreas digests starch to enable absorption by the villi

The picture shows the layers of tissues in a transverse section of the human small intestine. Which layer is labelled with the letter X?

• Mucosa

• Circular muscle

• Epithelium

• Longitudinal muscle

Tags

NGSS.HS-LS1-2

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

• The amount of blood pumped exceeds that of blood produced

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

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

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

Which row shows a valid comparison of arteries and veins?

• A

• C

• B

• D

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

Tags

NGSS.HS-LS1-3

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

• Atrioventricular valves: open. Semilunar valves: closed.

• Atrioventricular valves: closed. Semilunar valves: open.

• Atrioventricular valves: closed. Semilunar valves: closed.

• Atrioventricular valves: open. Semilunar valves: open.

Tags

NGSS.HS-LS1-3

Which process is occurring in the small intestine?

• A

• B

• C

• D

Tags

NGSS.MS-LS1-2

NGSS.MS-LS2-3

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

Tags

NGSS.HS-LS1-2

Which part of the body secretes amylase, lipase and endopeptidase for use in the digestion of food?

• Mouth

• Pancreas

• Stomach

• Small intestine

Tags

NGSS.MS-LS1-7