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Author Question: Which of the following is NOT a means by which substances such as oxygen, carbon dioxide, and ... (Read 102 times)

tingc95

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on: Jul 3, 2018
Which of the following is NOT a means by which substances such as oxygen, carbon dioxide, and nutrients exchange across a semipermeable membrane?
 
  a. Diffusion
  b. Osmosis
  c. Facilitated diffusion
  d. Active transport

Question 2

The beneficial effects of epinephrine in cardiac arrest are thought to be due to its:
 
  a. Alpha adrenergic effects
  b. Beta adrenergic effects
  c. Dopaminergic effects
  d. Parasympathetic effects


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jonathanballen97

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Reply #1 on: Jul 3, 2018
Answer to Question 1

b
Rationale: a. Diffusion is the movement of a solute or gas across a semipermeable membrane from an area of higher concentration to an area of lower concentration
b. Osmosis involves the movement of water, rather than substances.
c. facilitated diffusion is the movement of a solute across a semipermeable membrane with assistance of a helper such as a protein
d. active transport is movement of a particle across a semipermeable membrane utilizing an energy source such as adenosine triphosphate

Answer to Question 2

a
Rationale: a. Correct.
b. While epinephrine has beta adrenergic effects, it is thought that the alpha1 effects of vasoconstriction have more of a role in increasing blood flow through coronary vessels.
c. Epinephrine does not have dopaminergic effects.
d. Epinephrine does not have parasympathetic effects.


tingc95

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Reply #2 on: Jul 3, 2018
Thank you :)


jonathanballen97

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Reply #3 on: Jul 3, 2018
Happy to help you


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