science 10 feb

8/7/2019 science 10 feb

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3.5 The cell as a basic unit of life

3 The cell as the basic unit of life


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Nerve cellEpithelial

cell

Muscle cell


with different shapes,

different functions


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Cell

Red blood cell-transport oxygen

throughout the body.

Muscle cell- to allow the movements of the

body

White blood cell- kill germs that invade body


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Cell

Sperm cell- fertilizes the ovum in sexual

reproduction

Nerve cell (neuron)- conveys message

throughout the body


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System level

Organ level

Tissue level

Cells

Three levels of

organisation

of cell



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Epithelial

cellEpithelialtissue

Muscle cell

Muscle

tissue

A tissue is a group of similar cells thatperform the same function

Tissue level

Cells



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Animal Tissue Plant Tissue

muscular tissue

connective tissue

epithelial tissue

nervous tissue

mesophyll tissue

vascular tissue

epithelial tissue


Tissue level

Cells


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Organ level

Tissue level

Cells



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Muscular

tissue

Blood

tissue

Epithelial

tissue

Connective

tissue Stomach


Organ level

Tissue level

Cells

An organ is composed ofseveral different tissues

group together to make a certain function.


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organs in mammals organs in plants

heart

stomach

eyeskidneys

lungs

leaves

stems

rootsflowers

fruits


Organ level

Tissue level

Cells

Examples of


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System level

Organ level

Tissue level

Cells

Several organs and tissues

working together to form asystem. These organs and

tissues are coordinated in

the organisms.



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Digestive system

mouth

oesophagus

+

stomach

+

small intestine+

large intestine

+



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Endocrine system

Nervous system

Secretes

hormone to

maintain

activities ofbody

Organs

associated:

Pituitary glands,Thyroid glands,

pancreas,

adrenal glands,

ovaries and

testes

Coordinates

activities of the

body

Organs associated:

Brain, spinal cord

and nerve fibres


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Skeletal muscle

Provides

support to the

body,

maintains the

shape of the

body, protects

internal organs

and allow bodymovements

Organs

associated:

Bones andcartilages

Blood circulatory system

Transports

nutrients,

oxygen and

excretory

products

Organs

associated:

Heart, veins

and arteries


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Muscular system

Moves

parts ofthe body

Organs

associated:

Musclesand

tendons

Respiratory system

Takes in oxygen

and removescarbon dioxide.

Oxidizes food to

produce energy.

Organsassociated: Nose,

trachea, lungs,

diaphragm


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Excretory system

Removes

excretory

products from

the body

Organs

associated:

Lungs, skin,kidneys and

urinary bladder

Reproduction system

Give birth to

babies

Organs

associated:

Man : Testes

and penis

Woman :Ovaries, uterus,

vagina


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Discussion Explain why human beings are complex

organisms?


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MindMap

consist of

working together to form

working together

to form

working together

to form

can be observed with

contain contain

contains

contains

contains

function function

function function

are used inare used inwhich are

Cells

microscope

control cells

activities

respiration

non-living

granules

food or waste

materials

chloroplasts

(in plant cells only)

photosynthesis

support

the cells

control of

materials in

and out of

the cell

support and

prevent entry

of excess

water

mitochondria

Animal cells Plant cells

nucleus

chromosomes

cytoplasm vacuole

cell sap

cell membrane cell wall

tissues

organs

system


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