IB Biology Topic B3.2 Transport Revision Notes (SL/HL)

Release and Reuptake of Tissue Fluid: A Pressure Balance Along the Capillary

Definition

Tissue fluid

Fluid found in the spaces around cells

Tissue fluid, also called interstitial fluid, is the fluid that surrounds cells in tissues, formed from plasma that leaves the capillaries.

Common Mistake

Tissue fluid is not identical to blood plasma.
It comes from plasma but lacks the large plasma proteins and blood cells, which stay inside the capillary.

Formation at the Arterial End: High Blood Pressure Filters Fluid Out

Blood enters the capillaries from the arterioles under high pressure.
At the arterial end, the hydrostatic (blood) pressure is greater than the osmotic pull of the plasma proteins.
This net outward pressure forces plasma out through the permeable capillary wall to form tissue fluid.
1. This filtering of fluid under pressure is called pressure filtration (ultrafiltration).
2. The large plasma proteins and blood cells are too big to pass through, so they stay in the capillary.

Release and Reuptake of Tissue Fluid: A Pressure Balance Along the Capillary

Definition

Tissue fluid

Fluid found in the spaces around cells

Tissue fluid, also called interstitial fluid, is the fluid that surrounds cells in tissues, formed from plasma that leaves the capillaries.

Common Mistake

Tissue fluid is not identical to blood plasma.
It comes from plasma but lacks the large plasma proteins and blood cells, which stay inside the capillary.

Formation at the Arterial End: High Blood Pressure Filters Fluid Out

Blood enters the capillaries from the arterioles under high pressure.
At the arterial end, the hydrostatic (blood) pressure is greater than the osmotic pull of the plasma proteins.
This net outward pressure forces plasma out through the permeable capillary wall to form tissue fluid.
1. This filtering of fluid under pressure is called pressure filtration (ultrafiltration).
2. The large plasma proteins and blood cells are too big to pass through, so they stay in the capillary.

B3.2D Tissue fluid and the lymphatic system (HL)

B3.2D Tissue fluid and the lymphatic system (HL)

Subtopics and learning objectives

B3.2.11 Release and reuptake of tissue fluid in capillaries (HL)

Release and Reuptake of Tissue Fluid: A Pressure Balance Along the Capillary

Formation at the Arterial End: High Blood Pressure Filters Fluid Out

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Release and Reuptake of Tissue Fluid: A Pressure Balance Along the Capillary

Formation at the Arterial End: High Blood Pressure Filters Fluid Out

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A - Unity and Diversity

B - Form and Function

C - Interaction and Interdependence

D - Continuity and Change

B3.2D Tissue fluid and the lymphatic system (HL)

A - Unity and Diversity

B - Form and Function

C - Interaction and Interdependence

D - Continuity and Change

B3.2D Tissue fluid and the lymphatic system (HL)

Subtopics and learning objectives

B3.2.11 Release and reuptake of tissue fluid in capillaries (HL)

B3.2.12 Exchange of substances between tissue fluid and cells in tissues (HL)

B3.2.13 Drainage of excess tissue fluid into lymph ducts (HL)

B3.2.11 Release and reuptake of tissue fluid in capillaries (HL)

Release and Reuptake of Tissue Fluid: A Pressure Balance Along the Capillary

Formation at the Arterial End: High Blood Pressure Filters Fluid Out

Unlock the rest of this chapter with a free account

Release and Reuptake of Tissue Fluid: A Pressure Balance Along the Capillary

Formation at the Arterial End: High Blood Pressure Filters Fluid Out

Unlock the rest of this chapter with a free account