chapter 18 - transport system (part 3)

7/30/2019 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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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



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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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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.



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Symplast pathway

A way of water & ions move

through the cytoplasm/

protoplasm

Then passes from cell to cell

through plasmodesmata.



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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



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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).



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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

chapter 18 - transport system (part 3)

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