BIOL 246 Final EXAM

T/F Cholecystokinin, which is produced in the small intestine, inhibits gastric secretions in the stomach.

True

T/F Distention of the stomach has a direct stimulatory effect on the gastric glands.

True

T/F Gastrin functions to increase the production of HCl in the stomach.

True

T/F If urination is not convenient, the brain sends impulses down the spinal cord to inhibit the micturition reflex.

True

T/F Secretin is released from the duodenum in response to acidic chyme.

True

T/F The micturition reflex is coordinated by neurons in the spinal cord.

True

What organ produces bile?

liver

The direction of gas movement is determined by

partial pressure differences.

Which of the following enzymes is produced by the stomach?

pepsin

Involuntary muscle contractions which move a bolus through the gastrointestinal tract are called

peristalsis.

T/F The medulla oblongata controls gastric secretion both by the parasympathetic branch of the nervous system and the endocrine system.

False

T/F When chyme enters the duodenum, gastric secretion increases.

False

At the arterial end of the pulmonary capillaries,

O2 diffuses from the alveoli into the blood, while CO2 diffuses from the blood into the alveoli.

________stimulation via the ________ nerve causes the secretion of HCl in the stomach.

Parasympathetic ; vagus

Baroreceptors are located in the

aorta and carotid arteries.

Gastric secretion begins during the ________ phase and ends during the ________ phase.

cephalic ; intestinal

Which of the following does not occur during the gastric phase of gastric secretion? a) Gastrin begins to be secreted by the lower part of the stomach. b) Hydrochloric acid and pepsin secretion is stimulated in the upper and middle parts of the stomach. c) Tactile sensation of food in the mouth sends nervous impulses to the medulla oblongata. d) All of the choices are correct. e) None of the choices are correct.

d) All of the choices are correct.

Which of the following does NOT stimulate the secretion of HCl in the stomach? a) the smell of food b) the taste of food c) the distention of the stomach as it fills with food d) secretin e) All of the options listed stimulate secretion of HCl in the stomach.

d) secretin

During expiration

decreased alveolar volume causes increased alveolar pressure.

Which of the following inhibits the secretion of the gastric glands?

duodenum pH of less than two

Which of the following hormones does not inhibit gastric gland secretions?

gastrin

The hormone ______ stimulates secretion of _______ in the stomach.

gastrin ; pepsin

Secretin is released from the duodenum in response to

hydrochloric acid in chyme.

Which of the following is the correct order for the major parts of the gastrointestinal tract?

mouth, esophagus, stomach, small intestine, large intestine

Most nutrient absorption occurs in the

small intestine.

When urination is desired, decreased action potentials along which of the following causes relaxation of the external urinary sphincter?

somatic motor neurons

Hydrochloric acid is secreted in the

stomach.

At the venous ends of the pulmonary capillaries

the Pco2 is equal in the capillaries and in the alveoli.

Inspiration begins as

the diaphragm contracts.

In response to these impulses, which of the following cause the smooth muscle on the urinary bladder to contract?

the parasympathetic neurons from the spinal cord to the urinary bladder

When the urinary bladder becomes stretched, there is an increase in the frequency of action potentials traveling from

the urinary bladder to the sacral region