Chapter 31 - Lymphatic System (Elsevier Quiz Questions)

Lymph capillaries called lacteals are located in the: a. spleen b. liver c. thymus d. small intestine

d. Lymphatic capillaries in the wall of the small intestine are given the name lacteals. They transport fats obtained from food to the bloodstream.

Lymphatic vessels: a. have thinner walls than veins b. contain more valves than veins c. have lymph nodes located at intervals along their course d. all of the above

d. Lymphatic vessels are similar to veins except they have thinner walls, contain more valves, and have lymph nodes located at intervals along their course.

Lymph nodes located in the groin are called the: A. Inguinal lymph nodes B. Axillary lymph nodes C. Cervical nodes D. Popliteal nodes

A. The lymph nodes located in the groin are called the inguinal lymph nodes. Axillary nodes are found under the arms, cervical nodes are in the neck and upper chest area, and popliteal nodes are behind the knees.

In advanced old age, the thymus may be largely replaced by: A. Fat B. Protein C. Scar tissue D. Cartilage

A. The shrinking of the thymus is called "involution" and begins to occur during adolescence. In the older adult, the remaining tissue is replaced by fat primarily.

Lymph ducts empty into the circulatory system by draining into the: A. Jugular vein B. Subclavian veins C. Superior vena cava D. Inferior vena cava

B. The right lymphatic duct drains lymph from the upper right quarter of the body into the right subclavian vein. The thoracic duct drains lymph from the rest of the body into the left subclavian vein.

The spleen is located in the: A. Right hypochondriac region B. Left hypochondriac region C. Epigastric region D. Left lumbar region

B. The spleen is located below the diaphragm, above the left kidney and descending colon, and behind the stomach in an area known as the left hypochondriac region.

The tonsils located near the base of the tongue are called the: A. Palatine tonsils B. Pharyngeal tonsils C. Lingual tonsils D. Laryngeal tonsils

C. The lingual tonsils are located near the base of the tongue. The palatine tonsils are the tonsils usually removed when a tonsillectomy is necessary and are located on each side of the throat. Also known as adenoids, the pharyngeal tonsils can be found near the posterior opening of the nasal cavity. There are no such organs as laryngeal tonsils.

Which is not an organ of the lymphatic system? A. Thymus B. Spleen C. Pancreas D. Tonsils

C. The pancreas is an organ of the digestive and endocrine systems.

Lymph circulation relies on all of the following except: A. valves in the vessel walls B. skeletal muscle contractions C. respiratory movements D. the heart

D. The heart pumps fluids through the circulatory system and not the lymphatic system. The lymphatic system is not a closed system, so it must rely on valves in the vessels, skeletal and smooth muscle action, respiratory movements, and pressure gradients to circulate the lymph.

Which of the following are functions of the lymphatic system? A. It returns excess interstitial fluid to the blood. B. It absorbs fats and fat-soluble vitamins from the digestive system and transports them to the venous circulation. C. It serves as a defense mechanism against invading organisms and disease. D. All of the above are functions of the lymphatic system.

D. The lymphatic system is actually a specialized component of the circulatory system. It serves the body by returning excess interstitial fluid to the blood, absorbing fats and fat-soluble vitamins from the digestive system and transporting them to the venous circulation, and serving as a defense mechanism against invading organisms and disease. These functions assist the body to maintain fluid balance and provide immunity, which is essential to well-being.