BIOL 2402: Exam 4

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1

Air moves out of the lungs when the pressure inside the lungs is .

greater than the pressure in the atmosphere

2

The relationship between gas pressure and gas volume is describes by .

boyle's law

3

The statement " in a mixture of gases, the total pressure is the sum of the individual partial pressures of gases in the mixture" paraphrases .

dalton's law

4

Surfactant helps to prevent the aveoli from collapsing by .

interfering with the cohesiveness of water molecules, thereby reducing the surface tension of alveolar fluid.

5

With the Bohr effect, more oxygen is released because an .

decrease in pH (acidosis) weakens the hemoglobin-oxygen bond

6

The local matching of blood flow with ventilation is .

ventilation-perfusion coupling

7

The most powerful respiratory stimulus for breathing in a health person is .

increase of carbon dioxide

8

The pyloric sphincter regulates passage of chyme from the stomach into the duodenum.

true

9

Tidal volume is air .

exchange during normal breathing

10

Possible causes of hypoxia include .

too little oxygen in the atmosphere

11

Which statement about CO2 is incorrect?

more CO2 dissolves in the blood plasma than is carried in the RBCs.

12

Oxygen and carbon dioxide are exchanged in the lungs and through all cell membranes by .

diffusion

13

How is the bulk of carbon dioxide carried in blood?

as the bicarbonate ion in the plasma after first entering the red blood cells

14

What does NOT influence hemoglobin saturation?

nitric oxide

15

Smoking diminishes ciliary action and eventually destroys cilia.

true

16

Alcohol id first absorbed at the .

stomach

17

The type of tooth responsible for tearing and shredding is the .

canine

18

The function of the hepatic portal circulation is to .

collect absorbed nutrients for metabolic processing or storage.

19

What hormone causes an increased output of enzymes-rich pancreatic juice and stimulates gallbladder contraction to release bile?

cholecystokinin

20

This statement is true concerning the number and type of permanent teeth:

there are 32 permanent teeth, and the wisdom teeth are the last to emerge.

21

Saliva does NOT .

contain enzymes that begin the breakdown of proteins

22

Hydrochloric acid is secreted by the of the stomach.

parietal cells

23

There are three phases of gastric secretion. The cephalic phase occurs .

before food enters the stomach and is triggered by aroma, sight, or thought.

24

Pepsinogen, a digestive enzyme, is secreted by the .

chief cells of the stomach

25

You have just eaten a meal high in complex carbohydrates. What enzymes will help to digest the meal?

amylase

26

The ducts that deliver bile and pancreatic juice from the liver and pancreas, respectively, unite to form the .

hepatopancreatic ampulla

27

What vitamin requires intrinsic factor in order to be absorbed?

B12

28

Digestion of would be affected the most if the liver was damaged

lipids

29

What is an essential role played by large intestine bacteria?

synthesize vitamin K and B-complex vitamins

30

Surgical cutting of the ligual frenulum would occur in the part of the body.

oral cavity

31

The part of the peritoneum that covers the external surfaces of most digestive organs is the visceral peritoneum.

true

32

What part of the tooth bears the force of chewing?

enamel

33

portal triads contain a branch of the hepatic artery, hepatic portal vein and bile duct.

true