BIOS 255 Comprehensive Exam 3
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BIOS 255 Comprehensive Exam 3
- Define positive feedback
Answer: A self-amplifying cycle that leads to greater change in the same direction
- Define negative feedback
Answer: A process in which the body senses a change and activates mechanisms that negate or reverse it
- What is epithelial tissue?
Answer: a sheet of cells that covers a body surface or lines a body cavity
- Is epithelial tissue vascular or avascular?
Answer: avascular (it contains no blood vessels)
- why is epithelial tissue polar?
Answer: These cells are polarized and form extensive cell-cell adhesions, including adherens junctions and tight junctions, with each other
- epithelial tissue role in regeneration
Answer: capable of rapidly replacing damaged and dead cells.
- types of protein fibers in connective tissue
Answer: collagen fibers, reticular fibers, elastic fibers
- what is chondroitin sulfate and where is it located?
Answer: provides support and adhesiveness in cartilage, bone, skin, and blood vessels *most commonly found in cartilage*
- what is the function of keratin?
Answer: Prevents underlying structures from drying out
- What is a merocrine gland?
Answer: glands that release fluids by exocytosis
- what are the functions of merocrine glands
Answer: thermoregulation, secretion, protection
- What is a sebaceous gland?
Answer: a small gland in the skin which secretes a lubricating oily matter (sebum)
- function of sebaceous glands
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Answer: produce sebum (oil) into the hair follicles to lubricate the skin and hair.