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Unit 2-Chapter 5
Tissues
| Question | Answer |
|---|---|
| Which intercellular junction is the most likely to allow substances to move from one cell to another? | Gap junction |
| What is a tissue? | A tissue is a layer or group of similar cells with a common function, that interacts with other tissues to form an organ. |
| What are the different types of intercellular junctions? | Types of intercellular junctions include tight junctions, desmosomes, and gap junctions. |
| List the four major types of tissue. | The four major types of tissue are epithelial, connective, muscle, and nervous tissues. |
| List the general characteristics of epithelial tissue. | Epithelial tissues cover the external body surface and organs and the inner linings of body cavities and hollow organs, and make up glands. They are typically densely packed together, forming a barrier. |
| Explain how epithelial tissues are classified. | Epithelial tissues are classified primarily based on the shape of their cells and the number of cell layers they form, squamous (flat), cuboidal (cube-like), columnar (column-like), simple (single layer) or stratified (multiple layers). |
| Distinguish between exocrine and endocrine glands. | Exocrine glands secrete products into ducts that open onto an external or internal body surface. Endocrine glands secrete substances into the blood or tissue fluid. |
| Distinguish between serous fluid and mucus. | Serous fluid is thin and watery, and is used as a lubricant. Mucus is thick, sticky, high in mucin, and lower in water content than serous fluid; it protects underlying tissue. |
| What are the major types of cells in connective tissue? | The major types of cells in connective tissue are fibroblasts, macrophages and mast cells. |
| What is the primary function of fibroblasts? | Fibroblasts produce fibers in the extracellular matrix. |
| What are the functions of adipose connective tissue? | Adipose tissue cushions against injury, insulates against heat loss, and stores energy in the form of fat in its adipocytes (fat cells). |
| Distinguish between reticular and elastic connective tissues. | Reticular connective: a network of thin, reticular fibers which acts as a supporting framework in some organs. Elastic connective: mainly elastic fibers with some collagen fibers and fibroblasts; it allows for stretching, or elasticity. |
| What is the consistency of the extracellular matrix of blood? | Fluid |
| What are the major components of blood? | Blood consists of formed elements (cells and fragments) in a liquid matrix, called blood plasma. The formed elements consist of red blood cells, white blood cells, and cytoplasmic fragments called platelets. |
| Describe the general characteristics of nervous tissue. | Nervous tissue is found in the brain, spinal cord, and peripheral nerves. It coordinates, regulates, and integrates body functions. Its major cell types are neurons, which are excitable cells, and neuroglia. |