Chapter 18 - Transport System (Part 3)
Transcript of Chapter 18 - Transport System (Part 3)
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TRANSPORT SYSTEM
Powerpoint@lecture Slides Are Prepared By Biology Lecturer, KMPk
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PREVIOUS LESSON
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LECTURE 3
,18.2 LYMPHATIC SYSTEM :ROLE IN
TRANSPORT
18.3 TRANSPORT IN PLANTS
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OBJECTIVES
Give an overview of the human lymphatic system
Describe the transport of lipids from small intestine
into the blood stream
Describe the pathway by which water is transported
from surrounding soil to the root vascular system
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Human lymphatic organ
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An accessory
circulatory system that
is connected with blood
circulation.
Clears away infection
and keeps body fluids
in balance
Human lymphatic system
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Human lymphatic system
Made up of
lymph vessels
carry fluid called lymph
throughout bodylymph nodes
as filters for foreign particles
lymph
contain white blood cell
Bone marrow and thymus
produce the cells in lymph
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Consist of
Lymphatic capillaries
Lymphatic vessels Lymph node
Lymph
Blood plasma
Tissue fluid
Human lymphatic system
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Fluid return by the
Lymphatic system
As blood enter the capillary
networkproduce high
pressure (arteries larger than
capillaries)
plasma move out (form
capillaries) into interstitial
fluid of tissues
plasma contains (white blood
cell, glucose, amino acid,
salt, gases)
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Fluid return by the
Lymphatic system
Excess interstitial fluid enters
lymph capillaries and become
lymph
lymph is convey into
lymphatic system through
lymph vessel
Lymphatic vessel deliver
lymph into 2 main channels
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Lymphatic system main
channels
1. Right lymphatic duct
Drains lymph from the right
side of body
into right subclavian vein
1. Thoracic duct
Drains lymph from the rest of
body Into left subclavian vein
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Lymph Flow
Lymphatic capillary
Lymphatic vessel
Lymphatic node
Right Lymphatic duct
Right Subclavian vein
Thoracic duct
Left Subclavian vein
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Transport of Lipids
Lumen
Lacteal
VilliIntestine
To liver
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Lacteallymphatic capillary
Functionabsorb dietary lipids into
the lymphatic system
from ileum
Transport of Lipids
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Lacteal absorb lipids (fats)
from the ileum
Lipids (fats)combine with
lymph
Transported to the thoracic duct(Largest lymphatic vessel in the
body)
Into liver fats converted tolipoproteins
Transported to tissues throughout the body and
stored in adipose cells as triglycerides
Transport of Lipids
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Water Transported in
Plant
The movement of water into
and across the root
Water enters the plants through:Soil Epidermis Root
cortex Xylem
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Water Transported in Plant
3 pathways of water
transported from
surrounding soil to
the root :
Apoplast pathway
Symplastic pathway
Vacuolar pathway
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Water Transported in Plant
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Apoplast pathway
A way of water & mineral
ions move along the cellularcell wall Without the involvement of
any membranes. The cortex of the root does
not oppose such movementof the water.
Water Transported in Plant
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Symplast pathway
A way of water & ions move
through the cytoplasm/
protoplasm
Then passes from cell to cell
through plasmodesmata.
Water Transported in Plant
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Vacuolar pathway
The symplast can also have
the subdivision of the
vacuolarpathway
A way of water & ions move
from vacuole to vacuole
through neighbouring cells
crossing the cytoplasm &
tonoplasts
Water Transported in Plant
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Casparian strip effectively blocks the apoplast pathway at theendodermis.
Water enters the stele through the symplast pathway.
Prevents leakage of water from xylem vessels and aids the
development of root pressure (an upwards force pushing water
up the stem).
Water Transported in Plant
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Biology Unit, KMPk 24
Water enters into the root by osmosisWater enters into the root by osmosis
the water potential increasethe water potential increase
the neighboring cell has a lower water potentialthe neighboring cell has a lower water potential
Water moves by osmosis from root to neighbouring cellWater moves by osmosis from root to neighbouring cell
and to xylemand to xylem
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Water movement via cohesion-tension
mechanism and root pressure.
Mineral ion uptake in roots by active transport
and diffusion.
Pressure Flow Hypothesis in phloem