cells, tissues, and organs the organization of multicellular organisms
TRANSCRIPT
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Cells, Tissues, and Organs
The organization of multicellular organisms
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In this lesson, you will learn…
• The difference between unicellular and multicellular organisms
• that cells of similar structures are organized into tissues
• that several tissues may make up an organ
• that organs are organized into systems
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Unicellular Organisms
Paramecium Amoeba
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Unicellular Organisms
• Paramecium– Microscopic organism– Found on surface of water
(eg: pond, river)– Has hair surrounding the
body for movement– Has a mouth
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Unicellular Organisms
• Amoeba– Often found at bottom of ponds
or under rocks– Does not move fast– No arms, legs, eyes, mouth– Eats by surrounding its prey with
its body – Lives only for 2 days – Reproduce by spliting itself into
2 new amoebas
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Multicellular Organisms
• Have many different cells
• Different cells perform different functions
• Examples– Plants– Humans
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Cells in a Human
• Examples– Red blood cell (transport
oxygen)
– Nerve cell (have nerve fibres to transmit signals to and from the central nervous system)
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Cells in a Plant
• Examples
– Root hair cell
– Leaf guard cell
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From cells to tissues
• Tissue
– Group of similar cells that are specialized to perform a particular function
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Tissues in a Human
• Epithelial tissue– Covering or lining tissue
to protect structure beneath it
Connective tissue– Joins, stores or
supports all parts of an organism
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Tissues in a Human
• Muscle tissue– Cause movement
• Nerve tissue– Carry messages
from one part of body to another by conducting electrical signals
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Tissues in a Plant
• Epidermal tissue
– Protects plant against injury and losing too much water
• Vascular tissue
– Transports materials within a plant
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Tissues in a Plant
• Photosynthesis tissue
– Carries out photosynthesis in a plant
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From Tissues to Organs
• Organ
– Group of specialized tissues that are gathered in a certain part of the body to perform a particular function together
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Organs in a Human
• Examples– Skin – Lungs– Heart
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Organs in a Plant
• Examples– Leaves– Stem– Roots– Flowers
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From Organs to Systems
• System
– Different organs working together to perform a major function in an organism
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From Systems to Organisms
• Organism
– Made up of different systems working effectively in a coordinated manner
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The Human Body
- An organism
CELLS
TISSUES
ORGANS
ORGAN SYSTEMS
ORGANISM
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Division of Labor• Each cell in a multicellular organism
does not perform all the bodily functions.
• Each type of cell is specialized to perform one particular function.
• Different functions in a multicellular organism can be performed at the same time by dividing the work.
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Division of Labor
• Division of labor
– Sharing different functions in an organism among its cells, tissues, organs and systems ensures smooth running and effective working of the different parts in an organism as well as the organism as a whole
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Main Organ Systems in a Human
• Respiratory system
• Digestive system
• Skeletal system
• Blood circulatory system
• Excretory system
• Muscular system
• Nervous system
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Respiratory System
• Respiration– Process in which cells release energy from
the food we eat– Oxygen is required– Carbon dioxide is removed
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Respiratory System
Nasal Passage
Pharynx
Trachea
Bronchus
Larynx
Bronchioles
Alveoli
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Respiratory System
• Mechanics of breathing
Exhalation
Inhalation
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Digestive System
• Digestion
– Process in which large, insoluble food substances are broken down into smaller, soluble food substances for absorption into blood
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Digestive System
Villi
Mouth
Liver
Pharynx
StomachLarge Intestine
Small Intestine
Oesophagus
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Skeletal System
• Supports our body
• Gives us shape
• Protects our organs
• Enables movement
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Skeletal System
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Circulatory System
• Transports nutrients, gases, water and hormones to different parts of the body
• Include red blood cells, white blood cells, heart, blood vessels
Red blood cells
White blood cells
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Blood Circulatory System
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Excretory System• You must also get rid of fluids. The results of the
excretory system is urine. • Kidneys are the core organs involved in the excretory
system. Kidneys act as a filter. Eventually all of the blood in your body passes through the kidneys and they are able to do their filtering magic. The kidneys pull harmful molecules out of your bloodstream and leave the ones that are good for you.
• Related body parts include the ureters, bladder, and urethra. Once the urine passes through your urethra, it's out of your body.
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Muscular System
• Enables movement by contraction and relaxation of muscles
• 3 muscle types:– Skeletal muscles– Smooth muscles– Cardiac muscles
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Muscular System
DeltoidPectoralis major Biceps brachi
Gluteus maximus
Rectus femoris
Gastrocnemius
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Nervous System
- Consists of the brain, spinal cord and nerves found throughout our body
- Controls and coordinates functions throughout our body
- Enables us to respond to changes around us
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Nervous System
Cerebrum
Corpus callosum
Cerebellum
Thalamus
Hypothalamus
Midbrain
Pons
Medulla oblongata
Spinal cord
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Plant Transport System