Exam 15: The Digestive System

Respiration is inhibited throughout the entire time that swallowing is taking place.

Considerable vitamin absorption occurs passively in the stomach.

The acquired salivary reflex occurs upon stimulation of chemoreceptors and/or pressure receptors in the mouth.

The pharyngoesophageal sphincter is normally closed to prevent oesophageal secretions from entering the pharynx during breathing.

The islets of ____________________ are the endocrine cells of the pancreas.

The primary wave of peristalsis in the oesophagus is initiated by the ____________________.If this primary wave fails to push the bolus to the stomach, a secondary peristaltic wave is initiated by the ____________________.

Match the hormone(s), labelled a. through d., to the descriptions. (Options may be used more than once or not at all.) -stimulate(s) pancreatic aqueous NaHCO₃ secretion

Which of the following does NOT enter the duodenal lumen

Match the gastric cell types, labelled a. through d., with the correct characteristics. (Options may be used more than once or not at all.) -secrete pepsinogen

What are the symptoms of constipation (e.g., abdominal discomfort, headache, and nausea) due to

The main sympathetic nerve supply to the digestive tract is the vagus.

What is secreted by the chief cells of the gastric mucosa

Fats are digested to which of the following

Where is the swallowing centre located

Match the hormone(s), labelled a. through d., to the descriptions. (Options may be used more than once or not at all.) -inhibit(s) gastric motility

Upon arrival of a new meal in the stomach, the gastrocolic reflex pushes the colonic contents into the rectum, triggering the defecation reflex to eliminate the remains of a preceding meal.

The liver receives venous blood coming directly from the digestive tract, and arterial blood coming from the aorta.

Humans are not capable of digesting cellulose, but some of the enteric bacteria have this capability.

Which of these statements does NOT apply to stomach acid

Bile is secreted continuously by the gallbladder.