A&P II Exam 3

For air to flow into or out of the lungs, there must be

a pressure gradient established between the atmosphere and the alveoli

one major functions of the large intestine is to

absorb water

Diffusion and active transport are important in

absorption of food

The formation of basic pancreatic juice by the pancreas to neutralize stomach acids involves the

active transport of bicarbonate ions from pancreas cells into bicarbonate ions to the blood

Movement of oxygen from the alveolus to the pulmonary capillary occurs because

alveolar PO2 is greater than capillary PO2

What effect would an increase in the O2 concentration in the blood in lung capillaries have on blood flow through the lung?

alveolar capillaries dilate to speed up flow

Gas exchange between the air in the lungs and the blood takes place in the

alveoli

The respiratory zone of the lung includes which of the following?

alveoli

Which of the following are secreted by the pancreas?

amylase and lipase

The walls of the alveoli

are composed of simple squamous epithelium.

The trachea

bifurcates to form the primary bronchi

Most oxygen is transported in the blood

bound to hemoglobin

Which of these are not salivary glands?

buccal glands

The _____ covers the root of a tooth

cementum

Food in the stomach is squeezed and mixed with gastric juices, forming a semi liquid called

chyme

Blockage of the ileocecal valve would prevent

chyme from entering the large intestine.

The muscularis externa layer in the wall of the digestive tract is

composed of a layer of circular smooth muscle fibers and a layer of longitudinal smooth muscle fibers

Which of the following is a function of the hepatocytes?

detoxify substances

Carbon dioxide and oxygen are exchanged across the respiratory membrane by the process pf

diffusion

which of the following is a function preformed by the digestive system

elimination of undigested food

Bile

emulsifies fats in the small intestine

During swallowing, the opening into the larynx is covered by the

epiglottis

A student in A&P II lab first exhales normally; then using forced expiration, she exhales as much air as possible. That volume of air exhaled second is called

expiratory reserve volume

Which of the following functions is not associated with the nasal cavities?

external respiration

external respiration refers to the

gas exchange between the air in the lungs and the blood

The anal canal

has an external sphincter composed pf skeletal muscle

The oral cavity

has boundaries that include the lips, plate, and cheeks

Stomach ulcers can be caused by

helicobacter pylori

What portion of the small intestine is farthest from the pylorus of the stomach

ileum

Most carbon dioxide is transported in the blood

in the form of bicarbonate ions

The villi, microvilli, and plicae circularis function to

increase surface area for absorption

Emulsification

increases surface area for lipid digestion

Which of the following muscles decrease the volume of the thorax during relaxed exhalation?

internal intercostals

which of the following is not a characteristic of the large intestine

is longer than the small intestine

Which of the following organs is part of the digestive tract or alimentary canal?

jejunum

If the theocratic duct were tied off, which of the following classes of nutrients would not enter the circulatory system at their normal rate

lipids

Saliva

moistens food sand begins starch digestion in the mouth

The major secretion of the large intestine is

mucus

Whenever people cry, their nose runs. This is because the _______ drain tears into the nose

nasolacrimal ducts

Which of the following enzymes in mismatched with its substrate

pepsin - protein

Each lung is supplied by a

primary bronchus

Which of the following events occurs because of the low pH of the stomach?

proper environment for functioning of pepsin

From the outside to the lumen, the sequence of layers of the digestive tract wall is

serous membrane, muscularis externa, submucosa, mucosa

Which of the following is located closest to the rectum?

sigmoid colon

The diameter of the bronchioles can change because their walls contain

smooth muscle

The gallbladder

stores bile

Nutrient rich blood fro, the small intestine travel towards the liver by the way of the

superior mesenteric vein

The longitudinal layer of smooth muscle in the large intestine wall forms three bands called the

teniae coli

Which of the following statements regarding the lungs is correct?

the left lung contains two lobes while the right lung contains three lobes

When the inspiratory muscles contact

thoracic volume increases

Which of the following is a passageway for air?

trachea

Which of the following statements concerning the lungs and the pleura is true?

visceral pleura covers the surface of each lung