Lymphatics and lung Flashcards

1
Q

What is the purpose of the lymphatic system?

A

To return fluids from the tissues to the bloodstream and to detect pathogens & activate immune response.

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2
Q

True or False: When blood flows through systemic capillaries, a small amount of fluid is lost to the tissue spaces, but too much fluid loss is a bad thing.

A

True

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3
Q

What do lymphoid organs and tissues house?

A

Phagocytic cells and lymphocytes.

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4
Q

How many liters of fluid do lymphatic vessels return to the vascular system per day?

A

Approximately 3 liters.

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5
Q

What does the return of excess tissue fluid to the vascular system prevent?

A

Edema.

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6
Q

What leads to too much interstitial fluid?

A

Swelling.

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7
Q

What are the lymphatic organs?

A

Lymph nodes, thymus gland, spleen.

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8
Q

Where does lymph from the right side of the thorax, neck, and head dump into?

A

Right lymphatic duct and then right internal jugular vein.

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9
Q

Where does lymph from the abdomen, pelvis, legs, and left side of thorax, neck, and head dump into?

A

Thoracic duct and then left internal jugular vein.

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10
Q

What is the appearance of a normal lymph node?

A

Round/oval in shape, with an echogenic central fatty hilum and a hypoechoic perimeter.

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11
Q

True or False: Lymph nodes length does not matter/play a role in any kind of abnormality.

A

True

Lymph node length does not matter, only the height (A/P diameter) matters. Anything typically over 1 cm would be abnormal.

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12
Q

What is the appearance of a malignant node?

A

Rounded, with no echogenic hilum.

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13
Q

Where are lymph nodes found?

A
  • Neck
  • Axilla/breast
  • Retroperitoneum
  • Groin/upper thigh.
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14
Q

What is the largest lymphoid organ in the body?

A

Spleen.

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15
Q

Where is the thymus found?

A

Inferior neck and superior thorax.

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16
Q

What is the function of the thymus?

A

Maturation of T cells — plays a role in immune response.

17
Q

With which age group does the thymus mainly function?

A

Fetus & infancy.

18
Q

True or False: The thymus is the only lymphoid organ that does not directly fight foreign antigens.

19
Q

What do the lungs occupy in the thoracic cavity?

A

The entire thoracic cavity except for the mediastinum.

20
Q

What shape are each lung?

A

Cone-shaped and suspended within its own pleural cavity.

21
Q

What is the fluid surrounding the lungs called?

A

Pleural effusion.

22
Q

True or False: The pleura is a double wall sac that allows the lungs to move freely against other structures.

23
Q

How many lobes does the left lung have?

A

2 (superior and inferior).

24
Q

What separates the left lung lobes?

A

Oblique fissure.

25
Q

How many lobes does the right lung have?

A

3 lobes (superior, middle, inferior).

26
Q

What separates the right lung lobes?

A

Horizontal and oblique fissures.

27
Q

What exists between the air for air movement to occur?

A

Pressure gradient.

28
Q

What is the purpose of lung sonography?

A
  • Evaluate for effusions
  • Evaluate for collapsed lung
  • Evaluate for pneumothorax
  • Evaluate for atelectasis.
29
Q

Which mode is frequently used for lung ultrasound?

A

M-mode — looking for movement.

30
Q

If present, where will pleural effusion be in relation to the diaphragm?

A

Superior & posterior.

31
Q

What is the order of lymph fluid movement?

A

Lymphatic capillaries > lymphatic vessels > lymphatic trunks > lymphatic ducts > bloodstream.

32
Q

Do lymph vessels have valves?

A

Yes, to prevent backflow of lymph.

33
Q

What does the pleural cavity only contain?

34
Q

Where do the heart and lungs sit?

A

Within the thorax.

35
Q

Where does the heart sit?

A

Within the mediastinum.