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BIOL 373 UNIT 1 questions with complete solutions

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  • BIOL 373
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  • BIOL 373

BIOL 373 UNIT 1 questions with complete solutions

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  • September 18, 2024
  • 7
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • BIOL 373
  • BIOL 373
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BravelRadon
BIOL 373 UNIT 1

Physiology - correct answer ✔✔the science of the function of living systems



Function - correct answer ✔✔"why" the system exists/occurs



Process - correct answer ✔✔"how" the system works



Homeostasis - correct answer ✔✔Maintaining a relatively stable internal environment

- external environment <=|=> ECF <=> intracellular fluid

- oscillation around a set point



Response Loop - correct answer ✔✔stimulus, sensor, input signal, integrating center, output signal,
target, response



Feedback mechanisms - correct answer ✔✔Negative Feedback - stabilize variable

Feedforward control - anticipate change

Positive Feedback - reinforce stimulus (not homeostatic)



Homeostasis achieved by ______+______ systems and ______+______signals - correct answer
✔✔nervous + endocrine systems

electrical + chemical signals



Electrical signal - correct answer ✔✔change in membrane potential

- nerve and muscle cells



Chemical signal - correct answer ✔✔secreted into ECF by all cells (most comm)

, cell to cell communication (long range) - correct answer ✔✔Endocrine - hormone released into
bloodstream and distributed

Neural - electrical signal travel down neuron -> chemical signal at neurotransmitter -> transmit info to
next cell

Neuroendocrine - electrical signal down neuron -> chemical signal and secreted into blood



Target cells - correct answer ✔✔Cells that respond to signals

- only cells with receptor for that signal respond

- signal molecule that bind to receptor = ligand



Location of Receptors - correct answer ✔✔Surface receptor

- water soluble = hydrophilic = lipophobic

- most chemical signals are water soluble



Intracellular receptor

- water insoluble = hydrophobic = lipophilic



Types of Membrane Receptors - correct answer ✔✔



Each ligand has only one type of receptor. T/F - correct answer ✔✔False - same signals can have different
effects in different cell types



Increase in cell response to signals by - correct answer ✔✔increased expression of gene that codes for
receptor

increased expression of receptor proteins on cell surface



Decrease in cell response to signals by - correct answer ✔✔internalize surface receptors



Change receptor sensitivity by - correct answer ✔✔phosphorylization

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