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

Mucosa

Circular muscle

Epithelium

Longitudinal muscle

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

A

C

B

D

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