1. MUSCLE AND NEURAL TISSUE

2. MUSCLE TISSUES – GENERAL CHARACTERISTICS 1.Composed of many cells 2.Well-vascularized 3.Muscle cells are elongated. Muscle cell = muscle fiber 4.Muscle fibers are contractile – they change their shape to cause their attachments to move 5.Three different type = skeletal, smooth and cardiac

3. SKELETAL MUSCLE  Most abundant muscle tissue  Location - Muscle that is attached to bones of the skeleton  Function -They contract, causing body movements  Structure – long thin cells, with many nuclei, striated (banded) appearance  Control - Voluntary control (brain tells muscle to move)

4. Nuclei Striations

5. SMOOTH MUSCLE  Structure - Spindle-shaped cells with one centrally located nucleus, No visible striations  Location - Found in the walls of hollow organs other than the heart (digestive and urinary tract organs, uterus, blood vessels)  Control - Involuntary  Function – moving food thru digestive tract (peristalsis), expelling urine, constricting blood vessels

6. Nuclei

7. CARDIAC MUSCLE  Location - Only found in the wall of the heart  Function - Contracts to propel blood throughout the body  Structure – Mono-nucleated, Intercalated discs – specialized gap junction, Striated or banded appearance  Control - Involuntary (unconscious control)

9. NEURAL TISSUE  Neural tissue is the main component of the nervous system  Located in the brain, spinal cord and nerves  Neurons = highly specialized cells that generate and conduct nerve impulses  Transmit electrochemical signals to and from the brain