Cell organisation in humans

• Epithelial tissue

  • outer surface (skin)
  • digestive tract & respiratory tract
• Epithelial tissue

  • Protects against infection, injuries, chemicals and dehydration.
• Epithelial tissue coats the trachea with cilia (S: cilium).
• Smooth muscle

  • digestive tract
  • blood vessel
  • urinary tract
  • reproductive tract
• Skeletal muscle

  • hands and legs
• Cardiac muscle

  • Heart
• Contraction and relaxation of Smooth muscle enable involuntary activities.
• Skeletal muscle is involved in controlled movement.

  Skeletal muscle contracts and relax to generates movements in bones and limbs.
• Cardiac muscle build walls of heart that contract to pump blood to whole body. (Cardiac muscle contraction is involuntary)
• Nerve tissue is made of neuron or nerve cells.

  • Each neuron contains dendrite and axon.

  Detects stimuli and send information in the form of electrical signal (nerve impulses) to muscle or glands.

  Regulates and control body activities.
• Muscle tissue

  1. Smooth muscle
  2. Skeletal muscle
  3. Cardiac muscle
• Connective tissue

  1. Loose connective tissue
  2. Fibrous connective tissue
  3. Bone
  4. Blood tissue
  5. Adipose tissue
  6. Cartilage
• Loose connective tissue

  • Links to epithelial tissue to the tissue belows it.
  • fixes the organs in their positions.
• Fibrous connective tissue

  • form tendons (connects bone and muscle)
  • form ligament (connects bones to bones.)
• Blood tissue

  • regulation, transportation and protection.
• Bone

  • forms the body frame
  • protects the internal organs
• Adipose tissue

  • Connective tissue keep fat under the skin dermis and the surfaces of all main organ.
• Cartilage

  • Encloses bone tips to prevent the bones from wearing out.