1. BELLWORK

2. CHAPTER 4: TISSUES 4.3 & 4.4: Muscular and Nervous Tissue

3. MUSCULAR TISSUE  Tissue consist of elongated cells called muscle fibers  Muscle fibers are specialized to generate force  Muscle Tissue  Provides motion  Maintains posture  Generates heat  Types of Muscle Tissue  Skeletal  Cardiac  Smooth

4. MUSCULAR TISSUE  Skeletal Muscle  Attached to the skeleton  Can be controlled voluntarily  Cells have a striated look to them  Skeletal muscle cells are long, cylindrical, and have many nuclei  Causes gross body movements

5. MUSCULAR TISSUE  Cardiac Muscle  Found ONLY in the heart  Function is to pump blood to the rest of the body  Is under involuntary control  Cells have striated appearance  Only ONE nucleus per cell

6. MUSCULAR TISSUE (VIDEO) (VIDEO)  Smooth Muscle  Found in walls of hollow organs (stomach, bladder, uterus)  Controlled involuntary  Can contract (making organs smaller) or enlarge (making organ dilate) to move substances along  No striations  Smooth muscle cells have a single nucleus, and are spindle shaped  Peristalsis: moving food via contractions

7. NERVOUS TISSUE (VIDEO) (VIDEO)  Found in the brain, spinal cord and nerves  Mostly consist of 2 types of cells  Neurons: nerve cells that are sensitive to stimuli  Convert stimuli into nerve impulses (action potentials) and send the impulses to other neurons, muscles fibers or glands  Neuroglia  Don’t conduct nerve impulses

9. TISSUE REPAIR  Tissues repair themselves in 2 major ways.  Regeneration: the replacement of destroyed tissue by the same kind of cells.  Fibrosis: involves repair by dense connective tissue forming scar tissue.  The type of repair chosen depends on the type of tissue damaged and the severity of the injury.  Clean cuts heal much more easily and quickly than rips or tears

10. CHECK FOR UNDERSTANDING 1 1. Three types of muscle tissues 2. Has no striations, controlled involuntarily and found in the walls of hallow organs 3. Replacement of damaged tissue by the same type of cells 4. Has striations and is only found in the heart 5. Found in the brain, nerves and spinal cord 6. Responsible for gross body movements

11. CHECK FOR UNDERSTANDING 1 1. Three types of muscle tissues 2. Has no striations, controlled involuntarily and found in the walls of hallow organs 3. Replacement of damaged tissue by the same type of cells 4. Has striations and is only found in the heart 5. Found in the brain, nerves and spinal cord 6. Responsible for gross body movements 1.Skeletal, smooth, cardiac 2.Smooth 3.Regeneration 4.Cardiac 5.Nervous tissue 6.Skeletal