a&p2 Lymphatic/Immune Systems (unit 2)

Lymphatic/Immune Systems

Is the immune system an organ system?

no

What is the immune system?

a cell population that inhabits all organs and defends the body from agents of disease

What are pathogens?

organism capable of causing illness

What are the functions of the lymphatic and immune system?

• immunity

• lipid absorption

• fluid recovery

Is the lymphatic system necessary for reabsorbing fluid?

Yes it absorbs the remaining fluid that the blood capillaries couldn’t

What is edema caused by?

blocked lymphatic vessels

What is a lymph?

Clear, colorless fluid that is recovered fluid, similar to plasma but with much less protein

What do the lymphatic capillaries penetrate?

every tissue of the body

Are the lymphatic capillaries closed at one end?

yes

How are the lymphatic capillaries tethered to tissues?

by protein filaments

What is the role of the lymphatic vessel?

transports the lymph

What is the lymphoid tissue?

tissues composed of aggregates of lymphocytes and macrophages that populate many organs in the body

How are the lymphatic organs separated from surrounding organs?

by connective tissue capsules

What layers are the larger lymphatic vessels composed of?

• Tunica Interna

• Tunica Media

• Tunica Externa

What is the transport flow route of lymph?

1. lymphatic capillaries

2. lymphatic collecting vessels

3. lymphatic trunks

4. collecting ducts