Organs in Animals and Plants. What is an Organ? Each organ is made up of a group of tissues that...
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Transcript of Organs in Animals and Plants. What is an Organ? Each organ is made up of a group of tissues that...
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Organs in Animals and Plants
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What is an Organ?
• Each organ is made up of a group of tissues that work together to perform a specific purpose
• Most organs are made up of several different types of tissues– E.g. heart is made up of muscle, connective,
nervous, and epithelial tissue
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Skin
• Largest organ in your body• Protects the inner cells from damage • Defends against disease• Made of two different layers: epidermis and
dermis• Epidermis prevents bacteria and viruses from
entering the body and makes vitamin D when exposed to the sun
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Skin• Dermis is the inner layer made of:• Connective tissue (blood and blood vessels)• Nerves (sense pain, pressure, heat, and cold
and send information to the brain)• Muscle (produces Goosebumps)
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Lung
• Involved in respiration• lung is made of connective tissues and
epithelial tissue• Lungs coated with two sacs of connective
tissue separated by thin layer of fluid
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Breathing
• Breathe in through your nose/mouth• Air moves through pharynx into your trachea• Trachea is a flexible tube that is ringed with cartilage• Air moves through trachea into bronchus, into smaller
bronchial tubes, and then into tiny air sacs (called alveoli)
• Alveoli are surrounded by capillaries • Oxygen passes from alveoli into blood in the capillaries• Carbon Dioxide leaves the blood and enters the alveoli
to be exhaled
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The Heart
Septum divides the interior of the heart into 2 halves
Each halve has 2 chambers- an upper chamber called an atrium and a larger lower chamber called a ventricle
Each chamber is separated by a valve
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The Heart Cont’d Blood that has lost its oxygen and is
carrying waste enters the heart through 2 large blood vessels called the vena cava
Blood enters right atrium right ventricle the lungs Blood enters the left atrium left ventricle body
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Organs of Digestion
Tongue (epithelial, glands, connective, and muscle tissue)
Esophagus: muscular tube leading from mouth to stomach Peristalsis: rhythmic contraction and
relaxation of smooth muscles lining esophagus
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Organs of Digestion
Stomach (epithelial, connective, nervous, muscle tissue) Churns food with digestive juices and
enzymes Moves into intestines
Intestines Areas of chemical digestion and
removal of wastes
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Homework
Pg. 63 # 1-5, 8-13 Diagrams of Lungs, and Heart
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Plant Organs
• Recap of plant tissues1.Epidermal2.Ground3.Vascular4.Meristematic
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The Roots
• Collect water from soil and transport it to the stem
• Store food made in other areas of the plant• Bottom of root is covered by protective
epidermal tissue (the root cap)• Just below the root cap is a layer of
meristematic tissue (allows root growth)• Ground tissue and vascular tissue make up
centre of root
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The Leaf
• Tissues work together to perform photosynthesis
• Vascular tissue carries water from root to the leaf (and carries sugar to the rest of the plant)
• CO2 enters via stomata
• Majority of leaf made of specialized ground tissue (mesophyll)– Location of photosynthesis
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The Stem
• Two major functions– Transport water and nutrients throughout plant
(vascular tissue)– Support leaves/flowers (ground tissue)
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Homework
• Pg. 63 # 14-18