Make a simple line drawing of the organs of the alimentary canal and label each organ. Then add three labels to your drawing—salivary glands, liver, and pancreas—and use arrows to show where each of these organs empties its secretions into the alimentary canal.

Trace the path of a single protein molecule that has been ingested.

The protein molecule will be digested by enzymes made by

a. The mouth, stomach, and colon

b. The stomach, liver, and small intestine

c. The small intestine, mouth, and liver

d. The pancreas, stomach, and small intestine

Lara was on a diet but she could not eat less and kept claiming her stomach had a mind of its own. She was joking, but indeed, there is a 'gut brain' called the enteric nervous system. Is it part of the parasympathetic and sympathetic nervous system? Explain.

Trace the path of a single protein molecule that has been ingested.

The protein molecule must be digested before it can be transported to and utilized by the cells because

a. Protein is only useful directly

b. Protein has a low pH

c. Proteins in the circulating blood produce an adverse osmotic pressure

d. The protein is too large to be readily absorbed

Describe the two phases of swallowing, noting the organs involved and the activities that occur.

a. Describe the boundaries of the oral cavity.

b. Why do you suppose its mucosa is stratified squamous epithelium rather than the more typical simple columnar epithelium?

Trace the path of a single protein molecule that has been ingested.

Before the blood carrying the products of protein digestion reaches the heart, it first passes through capillary networks in:

a. The spleen

b. The lungs

c. The liver

d. The brain