to that of a neighbering eet? B) tight junctions B) basal lamina 30) Positive fe
ID: 3508336 • Letter: T
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to that of a neighbering eet? B) tight junctions B) basal lamina 30) Positive feedback differs from negative feedback because A) positive feedback is generally beneficial while negative feedoack is eypilly haf B) positive feedback tends to enhance the return the body to a homeostatic balance or "ideal" level C) positive feedback is critical to health while negative feedback verves only to slen trigger'ng stirnuhas while negative wkeideto potential health threats cascade effect while negative foodback causes . 31) Some of the nerve endings in the skin are sensitive to changes in temperature. They ane par of a negative feedback mechanism regulating body temperature. These nerve endings represent ) in the negative feedback mechanism. a(n A) homeostatic balance or "ideal" value B) effector C) control center D) receptor 32) A good example of a positive feedback mechanism would be A) body temperature regulation B) regulating glucose levels in the blood C) enhancement of labor contractions D) blood calcium level regulation 33) The functions of centrioles includeExplanation / Answer
28) During transcription the messenger RNA is synthesized from DNA using it as template and this process occurs in cytoplasm. Thus, option D is correct.
29) The gap junctions are known as cell to cell passages that allow the passing of small molecules and ions from one cell to another cell and the gap junctions have very important role in cellular communications. The option C is correct.
30) Positive and negative feedback mechanisms regulate the secretion of hormones and maintain homeostasis in the body. In positive feedback, the stimulus is increased. For example, the secretion of oxytocin triggers uterine contractions during child birth and the release of oxytocin is further increased due to positive feedback.
Negative feedback inhibits the secretion of hormones when they are found in increased concentrations in the blood. This enables to restore the homeostasis. For example, Anterior pituitary is stimulated by hypothalamus (TRH - thyrotropin releasing hormone) to produce (TSH - thyroid stimulating hormone) and TSH stimulates the thyroid gland to produce thyroxine hormone. When concnetration of thyroxine is increased the TSH and TRH secretions are inhibited and thyroxine secretion is also inhibited by negative feedback mechanism. Option b is correct.
31) Skin contains thermo receptors that act in response to changes in temperature and these recptors regulate the temperature of body by negative feedback mechanism. The receptors regulating the temperature are nerve endings of the skin and nerve endings act as receptors and the stimuli sent by receptors regulate temperature by cooling through evoparation. The option D is correct.
320 In positive feedback, the stimulus is increased. For example, the secretion of oxytocin triggers uterine contractions during child birth and the release of oxytocin is further increased due to positive feedback. Option C is correct.
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