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Questions and Answers
What characterizes epithelial tissue?
What characterizes epithelial tissue?
- It has loosely-packed cells with abundant extracellular matrix.
- It is composed of tightly-joined, closely-packed cells. (correct)
- It primarily functions in supporting other tissue types.
- It contains a high percentage of muscle fibers.
Which type of epithelial tissue provides a barrier against mechanical injury and microorganisms?
Which type of epithelial tissue provides a barrier against mechanical injury and microorganisms?
- Cuboidal epithelium
- Simple columnar epithelium
- Pseudostratified epithelium
- Stratified epithelium (correct)
What is the primary function of connective tissue?
What is the primary function of connective tissue?
- To bind and support other tissues. (correct)
- To generate electrical impulses.
- To form epithelial protective barriers.
- To facilitate movement through contraction.
What is the role of the extracellular matrix in connective tissue?
What is the role of the extracellular matrix in connective tissue?
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Which type of muscle tissue is responsible for voluntary movement?
Which type of muscle tissue is responsible for voluntary movement?
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What do dendrites do in nervous tissue?
What do dendrites do in nervous tissue?
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Which cell layer classification describes a single layer of cells?
Which cell layer classification describes a single layer of cells?
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Which of the following is NOT a primary type of animal tissue?
Which of the following is NOT a primary type of animal tissue?
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Study Notes
Epithelial Tissue (Covering)
- Comprised of tightly-joined, closely-packed cells with one side exposed to air or internal fluids and the other attached to a basement membrane.
- Acts as a protective barrier covering the surface of the body and lining internal organs and cavities.
- Serves as a barrier against mechanical injury, invasive microorganisms, and fluid loss.
- Provides surfaces essential for absorption, excretion, and transport of molecules.
- Cell shapes include:
- Squamous (flat)
- Cuboidal (cube-shaped)
- Columnar (column-like)
- Cell layer classifications:
- Simple (single layer)
- Pseudostratified (appears layered but is single-layered)
- Stratified (multiple layers)
Connective Tissue (Framework)
- Main function is to bind and support other tissues.
- Composed of fewer cells with a significant amount of extracellular matrix, which consists of a gel or web of fibers providing structural support.
- Connective tissue cells actively secrete the extracellular matrix.
- The matrix can vary in consistency - liquid, jelly-like, or solid.
Muscle Tissue (Movement)
- Made up of long cells known as muscle fibers.
- Primary function is contraction, enabling movement.
- Essential for voluntary and involuntary movements throughout the body.
Nervous Tissue (Control)
- Contains a central cell body acting as the "control center" of the neuron.
- Dendrites extend from the cell body to receive incoming signals.
- Axons are long extensions that transmit signals away from the cell body to other cells or effectors (muscles or glands).
- Responsible for sensing stimuli and transmitting nerve impulses across different parts of the body.
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