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Science > Lymphatic System > Flashcards

Lymphatic System Flashcards

1
Q

Lymphatic system functions

A

Transport escaped fluids back into blood

Essential roles in body’s defense system

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2
Q

Excess tissue fluid and plasma proteins carried by lymphatic vessels

A

Lymph

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3
Q

What occurs if fluids are not picked up

A

Edema

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4
Q

What picks up excess fluids (lymph) and returns it to the blood

A

Lymphatic vessels

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5
Q

What weave between tissue cells and blood capillaries

A

Lymph capillaries

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6
Q

What do lymph capillaries walls do

A

Overlap to form flap like mini valves

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7
Q

Where does fluid leak into

A

Lymph capillaries

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8
Q

What are lymph capillaries anchored to and by what

A

Connective tissue by filaments

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9
Q

What closes the mini valves

A

Higher pressure,on the inside

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10
Q

Where is fluid forced along

A

Along the vessel

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11
Q

What collects lymph from lymph capillaries

A

Lymphatic collecting vessels

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12
Q

Where does lymphatic collecting vessels carry lymph to and from

A

Lymph nodes

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13
Q

Where do lymphatic collecting vessels return fluid to

A

To circulatory veins near the heart

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14
Q

What does the right lymphatic duct do

A

Drains the lymph from the right arm and the right side of the head and thorax

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15
Q

What does the thoracic duct do

A

Drains lymph from the rest of the body

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16
Q

How are lymphatic vessels anatomy

A

Thin walled
Larger vessels have valves
Low pressure pump less system

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17
Q

How is lymph transportation aided

A

Milking action of skeletal muscles
Pressure changes in thorax during breathing
Smooth muscle in walls of lymphatics

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18
Q

What filters lymph before it is returned to the blood

A

Lymph nodes

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19
Q

What harmful materials are filtered in lymph nodes

A

Bacteria
Viruses
Cancer cells
Cell debris

20
Q

Engulf and destroy foreign substances such as bacteria, viruses, etc

A

Macrophages

21
Q

Respond to foreign substances in the lymphatic system

A

Lymphocytes

22
Q

How are lymph nodes shaped

A

Like kidneys

23
Q

Outer part of lymph nodes

A

Cortex

24
Q

Inner part of lymph nodes

A

Medulla

25
Q

What does the cortex contain

A

Follicles

26
Q

What are the follicles in the cortex

A

Collections of lymphocytes

27
Q

When do germinal centers enlarge

A

When antibodies are released by plasma cells

28
Q

What does the medulla contain

A

Phagocytes macrophages

29
Q

Flow of lymph through nodes

A
  1. Lymph enters the convex through afferent
    Lymphatic vessels

Lymph flows through a number of sinuses inside the node

Lymph exits through efferent lymphatic vessels

30
Q

Why is flow in the nodes slowed

A

There are fewer efferent than afferent vessels

31
Q

What other organs have lymphatic functions

A

Spleen
Thymus
Tonsils
Peyers patches

32
Q

Where is the spleen located

A

Left side of the abdomen

33
Q

What does the spleen filter

A

Blood

34
Q

What does the spleen form blood cells in

A

In the fetus

35
Q

What does the spleen act as

A

A blood reservoir

36
Q

Where is the thymus gland

A

Low in the throat overlying the heart

37
Q

What does the thymus gland do

A

Produces hormones to program lymphocytes

38
Q

What are tonsils

A

Small masses of lymphoid tissue around the pharynx

39
Q

What does the tonsils do

A

Trap and remove bacteria and other foreign materials

40
Q

What is tonsillitis caused by

A

Congestion with bacteria

41
Q

Where are the peyers patches found

A

In the wall of the small intestine and appendix

42
Q

What do peyers patches resemble

A

Tonsils

43
Q

What do peyers patches do

A

Capture and destroy bacteria in the intestines

44
Q

Mucosa associated lymphoid tissue

A

Peyers patches
Tonsils
Other small accumulations of lymphoid tissue

45
Q

What do mucosa associated lymphoid tissues act as

A

Sentinel to protect respiratory and digestive tracts

46
Q

Two parts of the lymphatic system

A
  1. Lymphatic vessels

2. Lymphoid tissues and organs

Science (11 decks)

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