Cells, Tissues, and Organs The organization of multicellular organisms

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

Unicellular Organisms Paramecium Amoeba

Unicellular Organisms Paramecium Microscopic organism Found on surface of water (eg: pond, river) Has hair surrounding the body for movement Has a mouth

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

Multicellular Organisms Have many different cells Different cells perform different functions Examples Plants Humans

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)

Cells in a Plant Examples Root hair cell Leaf guard cell

From cells to tissues Tissue Group of similar cells that are specialized to perform a particular function

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

Tissues in a Human Muscle tissue Cause movement Nerve tissue Carry messages from one part of body to another by conducting electrical signals

Tissues in a Plant Epidermal tissue Protects plant against injury and losing too much water Vascular tissue Transports materials within a plant

Tissues in a Plant Photosynthesis tissue Carries out photosynthesis in a plant

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

Organs in a Human Examples Skin Lungs Heart

Organs in a Plant Examples Leaves Stem Roots Flowers

From Organs to Systems System Different organs working together to perform a major function in an organism

From Systems to Organisms Made up of different systems working effectively in a coordinated manner

CELLS TISSUES ORGANS ORGANISM The Human Body - An organism CELLS TISSUES ORGANS ORGAN SYSTEMS ORGANISM

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.

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

Main Organ Systems in a Human Respiratory system Digestive system Skeletal system Blood circulatory system Excretory system Muscular system Nervous system

Respiratory System Respiration Process in which cells release energy from the food we eat Oxygen is required Carbon dioxide is removed

Respiratory System Nasal Passage Pharynx Larynx Trachea Bronchus Bronchioles Alveoli

Respiratory System Exhalation Inhalation Mechanics of breathing

Digestive System Digestion Process in which large, insoluble food substances are broken down into smaller, soluble food substances for absorption into blood

Digestive System Mouth Pharynx Oesophagus Liver Stomach Villi Mouth Liver Pharynx Stomach Large Intestine Small Intestine Oesophagus

Skeletal System Supports our body Gives us shape Protects our organs Enables movement

Skeletal System

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

Blood Circulatory System

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.

Muscular System Enables movement by contraction and relaxation of muscles 3 muscle types: Skeletal muscles Smooth muscles Cardiac muscles

Muscular System Deltoid Pectoralis major Biceps brachi Gluteus maximus Rectus femoris Gastrocnemius

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

Nervous System Cerebrum Corpus callosum Thalamus Hypothalamus Midbrain Cerebellum Thalamus Hypothalamus Midbrain Pons Medulla oblongata Spinal cord

Plant Transport System