THE TISSUE LEVEL OF ORGANIZATION TISSUE a group

• THE TISSUE LEVEL OF ORGANIZATION • • • TISSUE — a group of similar cells performing a common function • • 4 MAJOR TYPES : • • 1. EPITHELIAL TISSUES — tissues which cover or line the body’s internal/internal surfaces • • 2. CONNECTIVE TISSUES — support, protect, bind together the other tissue types • • 3. MUSCLE TISSUE — consists of specialized cells (muscle fibers) capable of shortening in length (contraction) and thus producing movement. • • 4. NERVOUS TISSUE — consists of specialized cells (neurons) capable of generating and transmitting electrochemical signals (impulses) and thus coordinating the functions of the other tissue types.

Nerve Brain & Spinal Cord Nerve Impulse Conduction

Skeletal Muscle Attached to Skeleton Movement, stabilize position of skeleton

Smooth Muscle Walls of blood vessels, internal organs Movement of food, urine, secretions and regulate blood vessel diameter

Cardiac Muscle Heart Circulates blood and maintains blood pressure

Simple Inner surface of trachea, respirator tract and intestines Columnar Diffusion, absorption and secretion

Simple Cuboidal Kidney tubules Diffusion, absorption and secretion

Simple Capillaries, air sacs (alveoli) and Bowman’s capsule Diffusion, absorption and secretion Squamous

Stratified Squamous Skin Protection against abrasion, pathogens and chemical attack

Stratified Cuboidal Sweat gland ducts, urethra, pharynx and conjunctiva Protection and secretion

Stratified Columnar Mucous membranes and large excretory ducts of glands Protection and secretion

Ciliated Pseudostratified Columnar Trachea and bronchi Protection and secretion

Transitional Bladder Stretch

Adipose Deep to skin, around organs Padding, cushion, insulation and energy storage

Dense Fibrouse Tendons, Ligaments and covers muscles (Fascia) Attachment and support

Elastic Lung, wall of artery, trachea, bronchial tubes, vocal cords (Larynx) Stretching

Reticular Liver, kidney, spleen, lymph node and bone marrow Supporting framework (stroma)

Deep to dermis, between muscles, around blood vessels , joints and nerves Areolar (adult) Cushion organs and provides support

Hyaline End of Long bones, Ribs, sternum, trachea, bronchi and nasal septum Support and reduce friction

Elastic Cartilage External ear and epiglottis Support

Fibrocartilage Intervertebral disk Support

Bone Skeleton Structure, support, mineral storage

Blood Circulatory System Defense and transport