1. a baby was born with congenital problems in the skeleton and muscle systems.
ID: 98031 • Letter: 1
Question
1. a baby was born with congenital problems in the skeleton and muscle systems. from what primary germ layers do these systems arise? What is the earliest developmental stage during which a problem could have affected just one primary germ layer?
2. summarize the structural characteristics of epithelial tissues that enable them to perform their specific functions?
3. Does the production of saliva, milk, or oil cause the most damage to the cell that produces it? Explain.
4. Describe the role of the fiber types in the classification of connective tissue. What examples can you find of these various types?
5. Explain how sufficient dietary intake of calcium could ensure the normal development of bone?
Explanation / Answer
1. The skeletal and muscular systems have their origin in the mesoderm.The earliest stage during development during which these types of tissues will be affected is during or after the process of gastrulation.
2. Squamous epithelium consists of cells that are flat and plate like. Squamous epithelium is present in alveoli, lining of blood vessels, pericardium, peritoneum
cuboidal epithelium consists of cube like cells. Cuboidal epithelium is found in ducts and tubules of the kidney, thyroid gland and germinal epithelium of ovary.
columnar epitheium consists of tall column like cells. It is present in lining of stomach, intestine and respiratory tract.
3. The production of oil will cause damage to the cell that produces it because sebum is an oily secretion which is produced by sebacious glands .And sebacious glands are holocrine cells, which means that holocrine secretions damage the cell that produces it.
4. There are three types of fibre present in connective tissue: collagen, reticular and elastic fibres.
Collagen fibres are made up of alpha polypeptide chains.These are the strongest fibres among connective tissue fibres.The function of these fibres is to bind bones and other tissues to each other. They are present in tendons, ligaments, cartilage, bones, inetvertebral discs.
Reticular fibres are made up of type 3 collagen.These fibres form a supporting network for other cells.These are present in liver, bone marrow and lymphatic organs.
Elastic fibres are made up of elastic microfibril and elastin.Their function is to provide the organs like lungs and heart to recoil.They are present in extracellular matrix.
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