Tissues and Organs

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Tissues and Organs

• The Human Body

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Tissues

• Epithelial Tissue - The cells of epithelial
  tissue pack tightly together and form continuous
  sheets that serve as linings in different parts
  of the body. 

Examples outer layer of the skin, the inside of
the mouth and stomach, tissue surrounding the
body's organs.
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Connective Tissue

• Connective tissue adds support and structure to
  the body.  Most types of connective tissue
  contain fibrous strands of the protein that add
  strength the tissue. 

Examples the inner layers of skin, tendons,
ligaments, cartilage, bone and fat tissue.  Blood
is also considered a form of connective tissue.
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Muscle Tissue

• Muscle tissue is a specialized tissue that can
  contract.  Muscle tissue contains the specialized
  proteins actin and myosin that slide past one
  another and allow movement. 

Examples of muscle tissue are contained in the
muscles throughout your body.
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Nerve Tissue

• Nerve tissue has the ability to generate and
  conduct electrical signals in the body.  These
  electrical messages are managed by nerve tissue
  in the brain and transmitted down the spinal cord
  to the body.

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Organs

• Organs are the next level of organization in
  the body.  They are structures that contain at
  least 2 different types of tissue functioning
  together for a common purpose.   
• Organs combine to make organ systems.

Examples the liver, kidneys, heart, even your
skin is an organ.  In fact, the skin is the
largest organ in the human body.
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Skeletal System

• Major Role Provide support for the body, to
  protect delicate internal organs and to provide
  attachment sites for the organs.
• Major Organs Bones, cartilage, tendons and
  ligaments.

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Muscular System

• Major Role Muscles work in pairs to move limbs
  and provide the organism with mobility.  Muscles
  also control the movement of materials through
  some organs, such as the stomach and intestine.
• Major Organs Skeletal muscles and smooth
  muscles.

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Circulatory System

• Major Role Transport nutrients, gases (such as
  oxygen and CO2), hormones and wastes through the
  body. 
• Major Organs Heart, blood vessels and blood.

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Nervous System

• Major Role Relay electrical signals through the
  body, direct behavior and movement.
• Major Organs Brain, spinal cord and peripheral
  nerves.

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Respiratory System

• Major Role Provides gas exchange between the
  blood and the environment.  Primarily, oxygen is
  absorbed from the atmosphere into the body and
  carbon dioxide is expelled from the body.
• Major Organs Nose, trachea and lungs.

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Digestive System

• Major Role breakdown and absorb nutrients that
  are necessary for growth and maintenance.
• Major Organs Mouth, esophagus, stomach, small
  and large intestines.

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Excretory System

• Major Role Filter out cellular wastes, toxins
  and excess water or nutrients from the
  circulatory system. 
• Major Organs Kidneys, ureters, bladder and
  urethra.

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Endocrine System

• Major Role
• Relay chemical messages through the body which
  help control processes such as nutrient
  absorption growth.
• Major Organs Many glands exist in the body that
  secrete endocrine hormones.  Among these are the
  hypothalamus, pituitary, thyroid, pancreas and
  adrenal glands.