Lymph (Tissue Fluid)
Formation, composition, and functions of lymph, also known as tissue fluid.
What is Lymph (Tissue Fluid)?
A colorless fluid derived from blood plasma that circulates in the lymphatic system, containing white blood cells (lymphocytes) and playing a role in fluid balance, fat absorption, and immune response.
Key points
- Describe the formation and composition of lymph.
- Explain the functions of lymph in the body.
- Differentiate lymph from blood plasma and interstitial fluid.
- Understand the role of the lymphatic system in fluid balance and immunity.
Common exam trap
Confusing lymph with blood plasma or interstitial fluid without understanding the differences in composition and location.
Definitions
- Term
Lymph
- Meaning
A colorless fluid derived from blood plasma that circulates in the lymphatic system, containing white blood cells (lymphocytes) and playing a role in fluid balance, fat absorption, and immune response.
- Term
Tissue Fluid (Interstitial Fluid)
- Meaning
The fluid that surrounds cells in tissues, derived from blood plasma that filters out of capillaries. It facilitates exchange of nutrients, gases, and waste products between blood and cells.
- Term
Chyle
- Meaning
The milky fluid consisting of lymph and emulsified fats, absorbed from the intestine into the lymphatic system during digestion.
Learning objectives
Describe the formation and composition of lymph.
Explain the functions of lymph in the body.
Differentiate lymph from blood plasma and interstitial fluid.
Understand the role of the lymphatic system in fluid balance and immunity.
Prerequisites
Basic understanding of blood circulation (arteries, veins, capillaries).
Knowledge of blood composition (plasma, RBCs, WBCs, platelets).
Cell biology basics (interstitial fluid, cell exchange).
Common mistakes
Confusing lymph with blood plasma or interstitial fluid without understanding the differences in composition and location.
Forgetting that lymph lacks red blood cells.
Not recognizing the dual role of lymph in fluid balance and immunity.
Keywords
Lymph
Tissue Fluid
Interstitial Fluid
Lymphatic System
Blood Plasma
Capillaries
Lymphocytes
Fluid Balance
Immunity
Fat Absorption
Chyle
Edema
Practice preview
What is lymph primarily composed of, besides water?…
easy
Which of the following components is typically absent or present in very low concentrations in lymph compared to blood plasma?…
medium
What is the primary function of lymph in the human body?…
easy