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BIOS 255 Comprehensive exam
- Negative feedback
- Examples of negative feedback
- Components of a feedback loop
- Positive feedback
- Examples of positive feedback
- epithelial tissue
- epithelia
–Answer A process in which the body senses a change and activates mechanisms that reverse it. Keeps a variable close to its set point. Negative feedback opposes original stimulus. MOST COMMON feedback loop.
–Answer body temperature, blood pressure, glucose regulation
–Answer stimulus, sensor, control center, effector
–Answer A type of regulation that responds to a change in conditions by initiating responses that will amplify the change. Takes organism away from a steady state. Enhances original stimulus
–Answer birth, blood clotting, lactation
–Answer Epithelial tissue consists of a sheet of closely adhering cells, one or more cells thick, with the upper surface usually exposed to the environment or to an internal space in the body.Epithelium covers the body surface, lines body cavities, forms the external and internal linings of many organs, and constitutes most gland tissue.
–Answer avascular (without blood vessels) —there is no room for them between the cells. Epithelia, however, usually lie on a vessel rich layer of connective tissue, which furnishes them with nutrients and waste removal 1 / 2
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- what is beneath epithelial tissue?
- are epithelial tissues polarized?
- *CONNECTIVE TISSUE* What is chondroitin sulfate and
- How are glycosaminoglycans charged?
- Where is chondroitin sulfate located in the body?
- What role do glycosaminoglycans (GAGs) have
- collagen fibers
- elastic fibers
- reticular fibers
- / 2
–Answer a basement membrane that serves as an anchor to the connective tissue layer beneath
–Answer epithelial cells establish an apical-basial polarity which results from the differential distribution of phospholipids, proteins complexes, and cytoskeletal components between the various plasma membrane domains reflecting their specialized functions
–Answer Chondroitin sulfate is the most common GAG (glycosaminoglycans)
–Answer GAGS are negatively charged, which attracts sodium and potassium ions, which in return causes them to absorb and retain water
–Answer found in blood vessels and bones
–Answer they regulate the water and electrolyte balance in tissues
–Answer provides flexibility and strength
–Answer Flexible and "stretchy" fibers that add elasticity to tissue
–Answer Fibers made of collagen fibers that are very thin and branched. interwoven