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PNB 2250 EXAM 4 (final exam review) Study GUIDE $12.49   Add to cart

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PNB 2250 EXAM 4 (final exam review) Study GUIDE

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  • PNB 2250

PNB 2250 EXAM 4 (final exam review) Study GUIDE stimulus - Ans:-detection by interaction with cellular proteins a change in cellular properties that generates a signal to other cells (chemical and electrical) causes a change in physiological state Control Systems - Ans:-(1) measure (2) compa...

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  • October 24, 2024
  • 60
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • PNB 2250
  • PNB 2250
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GraceAmelia
©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED

FIRST PUBLISH OCTOBER 2024




PNB 2250 EXAM 4 (final exam review)
Study GUIDE




stimulus - Ans:✔✔-detection by interaction with cellular proteins




a change in cellular properties that generates a signal to other cells


(chemical and electrical)




causes a change in physiological state


Control Systems - Ans:✔✔-(1) measure


(2) compare to desired values


(3) compute what changes need to be made




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, ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED

FIRST PUBLISH OCTOBER 2024




(4) correct and carry out


negative feedback process - Ans:✔✔-limited the change in physiological process




most common


postive feedback - Ans:✔✔-Accelerates the change in a physiological process




Inherently uncontrollable




Found in clotting and reproduction


feedback systems - Ans:✔✔-either on or off




there is no in between


homeostasis is based on 2 types of cells - Ans:✔✔-Neurons -- capable of electrical current flows across

membrane




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Endocrine cells - Release of chemical messengers into the blood


differences between neurons and endocrine cells in homeostasis - Ans:✔✔-(1) signal speed


(2) number of cells affect


(3) precision


(4) extensive overlap


what is regulated? - Ans:✔✔-critical factors that can cause rapid death (T, pH, amount of O2, etc)




less critical yet still improtant (blood levels of nutrients)


endocrine signaling - Ans:✔✔-Regulated secretion of extracellular signal




Diffusion of signal into blood & circulation throughout body




Diffusion of signal into extracellular space




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, ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED

FIRST PUBLISH OCTOBER 2024




Binding (interacting) with target cell




slower time frame, longer lasting effects




diffusion towards target cells, recognition effect


endocrine vs exocrine secretion - Ans:✔✔-endocrine (inner secretion)




exocrine (outer secretion)




sensory cells --> afferent (into) CNS input --> efferent (out of) response


paracrine vs autocrine - Ans:✔✔-paracrine (secretion to neighbors)




autocrine (secretion to oneself)


endocrine tissue - Ans:✔✔-Cells or glands (Derived from epithelium but also nervous tissue)




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