A&P CH.20 HW

The spleen

filters blood rather than lymph.

Thymosins

help in the maturation of T lymphocytes.

Lymph from most of the body drains

into the thoracic duct and then into the subclavian veins.

Lymphadenitis

is most often associated with an infection

MALT refers to

lymphoid tissue scattered throughout the body in mucous membranes.

Which group is correct?

major lymph ducts: right lymphatic duct, thoracic duct

A technique to determine if cancer has spread, without performing a traditional lymph node dissection, is called a

sentinel node biopsy.

Which of the following is true regarding lymph?

-It is formed from the plasma during capillary exchange. -Approximately 85% of lymph is returned into the blood capillaries and carried away as part of the venous blood. -The vessels form a one-way path, leading it back toward the large veins and heart. (all are true)

Elephantiasis is

-caused by the invasion and blockage of the lymphatic vessels. -the lymphatic obstruction caused by small parasitic worms called filariae. -manifested by extreme swelling. (all are true)

Which of the following is not a function of the lymphatic system?

Its only role is to absorb water and protein from the interstitium and return it to the blood.

Which of the following best describes tonsils, MALT, Peyer's patches, and the appendix?

Lymphatic nodules

Which one is not a function of the spleen?

Secretes hormones that promote the maturation of B cells

What happens if the lymphatic vessels fail to absorb interstitial fluid and protein?

The person develops lymphedema.

Which of the following is true regarding tonsils?

They include palatine, pharyngeal, and lingual tonsils.

This lymphatic organ is located within the mediastinum and is the site of T cell maturation.

Thymus gland

Lymphadenopathy is

a disease of the lymph nodes (often accompanies infection and cancer).

Peyer's patches

are patches of lymphatic tissue found in the lower digestive tract and perform an important phagocytic role.

If it is necessary to remove the spleen surgically, the patient may expect to

be more prone to infection.

Enlargement of these nodes may indicate an upper respiratory infection.

cervical

The lymph vessels

contain one-way valves that direct lymph toward their drainage site.