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BIOS 251 Final Exam: Questions & Verified Answers $10.99   Add to cart

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BIOS 251 Final Exam: Questions & Verified Answers

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BIOS 251 Final Exam: Questions & Verified Answers

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  • September 9, 2024
  • 10
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • BIOS 251
  • BIOS 251
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LeCrae
BIOS 251 Final Exam: Questions & Verified Answers

Components of the homeostatic control loop Right Ans - receptor, control
center, effector

Negative feedback Right Ans - -works to oppose change
-brings condition back to a set point

Positive feedback Right Ans - -works to enhance change
-brings condition further away from a set point

Tonicity Right Ans - relates to how the solution influences the shape of
body cells

Hypotonic solution Right Ans - RBC undergoes hemolysis (swelling)

Hypertonic solution Right Ans - RBC undergoes crenation (shrinking)

Osmosis Right Ans - -concentration of solutes per liter
-water moves from high concentration of water to low concentration of water

Factors that influence diffusion across a cell membrane Right Ans - -
steepness of concentration gradient
-temperature
-mass of diffusing substance
-surface area
-diffusion distance

Passive processes that move substances across the cell membrane Right
Ans - -Simple diffusion
-Facilitated diffusion

Osmosis processes that move substances across the cell membrane Right
Ans - -Active processes
-Active transport
-Vesicular transport

, Primary active transport Right Ans - energy derived from ATP changes the
shape of a transporter protein which pumps a substance across a plasma
membrane against its concentration gradient

Secondary active transport Right Ans - -energy stored (in a hydrogen or
sodium concentration gradient) is used to drive other substances against their
own concentration gradients
-substance is being transported "against its will"

Types of active transport in vesicles Right Ans - -endocytosis
-phagocytosis
-pinocytosis
-exocytosis
-transocytosis

Endocytosis Right Ans - cell takes up specific ligands that bind to cell
surface receptors into a vesicle

Phagocytosis Right Ans - -cell engulfs large particles such as old cell parts,
viruses, bacteria
-used by many immune system cells

Pinocytosis Right Ans - -cells take up small droplets of ECF
-no receptors involved
-"cell drinking"

Exocytosis Right Ans - -membrane-enclosed secretory vesicles fuse w/the
plasma membrane and release their contents into the ECF
-used to secretions such as sweat, oil

Transocytosis Right Ans - -a combination of endocytosis and exocytosis
used to move substances from one side of a cell, across it, and out the other
side
-example: capillary moves hormones to other side of vessel to be released into
blood via exocytosis

Merocrine secretion Right Ans - cells excrete their substances by
exocytosis

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