Quiz Questions

Exact questions and answers from Quiz 4

What best describes absorption?

Movement of nutrients through the alimentary canal wall into the blood or lymphatic vessels

Which salivary gland produces the greatest amount of saliva?

Submandibular gland

Which component of saliva binds antigens on pathogens?

Secretory IgA

True or false: The submandibular and sublingual glands are innervated by the facial VII nerve.

True

What best describes the [muscle in the] inferior third of the esophagus?

Only smooth muscle

True or false: The voluntary phase of deglutition is controlled by the cerebral cortex.

True

What are the major functions of the stomach?

Secretion, propulsion, and digestion

What is produced by chief cells?

Pepsinogen

True or false: Hydrochloric acid is formed inside the cells of gastric glands.

False

What processes occur in the small intestine?

Secretion, digestion, absorption, and propulsion

What is an example of chemical digestion?

Hydrolysis

Where are carbohydrates digested?

Mouth and small intestine

How is glucose absorbed across the brush border membrane?

Secondary active transport

What is the correct order for the digestion and absorption of lipids?

1. Digestion by gastric lipase

2. Emulsification by bile salts

3. Digestion by pancreatic lipase

4. Simple diffusion of the contents in micelles

5. Reformation of triglycerides

6. Exocytosis of chylomicrons

True or false: Trypsin is a pancreatic protease.

True

What is the function of the hepatic portal system?

It allows for blood containing nutrients, toxins, and wastes to go directly to the liver

What are the functions of the large intestine?

Secretion, propulsion, and defecation

True or false: The mass (propulsion) movements of the large intestine are stimulated by food consumption and controlled by the enteric nervous system (ENS).

True

What are the functions of the bacteria in the large intestine?

• They produce vitamins such as vitamin K

• They metabolize undigested materials such as soluble fibrous carbohydrates

• They prevent growth of harmful bacteria

• They stimulate the immune system

Which is a correct statement about water absorption in the digestive system?

A. 9 liters of water enter the large intestine per day.

B. 2 liters of water are secreted by accessory organs.

C. 7 liters of water are ingested.

D. 0.1 liter of water is excreted in the feces.

D, 0.1 liter of water is excreted in the feces

Which hormones will reduce acid secretion?

Somatostatin and secretin

True or false: Gastrin and bile secretion are examples of positive feedback in the digestive system.

True

True or false: The enterogastric reflex will increase acid secretion.

False

What hormone increases the secretion of bicarbonate?

Secretin

True or false: Parasympathetic neurons cause the smooth muscle of the sigmoid colon and rectum to contract and the internal anal sphincter to relax.

True