BELLWORK. CHAPTER 4: TISSUES 4.3 & 4.4: Muscular and Nervous Tissue.
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Transcript of BELLWORK. CHAPTER 4: TISSUES 4.3 & 4.4: Muscular and Nervous Tissue.
BELLWORK
CHAPTER 4: TISSUES
4.3 & 4.4: Muscular and Nervous Tissue
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
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
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
MUSCULAR TISSUE (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
NERVOUS TISSUE (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
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
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
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