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Test Bank (Complete Download) For Textbook of Histology 4th Edition by Gartner ISBN: 9780323355636 Instantly Downloadable Test Bank

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Test Bank (Complete Download) For Textbook of Histology 4th Edition by Gartner ISBN: 9780323355636 Instantly Downloadable Test Bank

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Test Bank (Complete Download) For Textbook of Histology 4th Edition by Gartner ISBN: 9780323355636 Instantly Downloadable Test Bank

Gartner: Textbook of Histology, 4th Edition
Chapter 2 – Cytoplasm
Test Bank
MULTIPLE CHOICE
1. The fluidity of the plasmalemma has well-established clinical significance. Which of the
following molecules decreases the cell membrane fluidity?
a. glycerol
b. phosphate group
c. cholesterol
d. integral proteins
e. peripheral proteins
Explanation:
The answer is c. Cholesterol decreases membrane fluidity. The polar heads of phospholipids
molecules are composed of glycerol, to which a positively charged nitrogenous group is
attached by a negatively charged phosphate group. Unsaturated fatty acyl molecules increase
membrane fluidity. Integral and peripheral proteins do not have an effect on membrane
fluidity.
2. A patient suffering from asthma has difficulty breathing and is treated with albuterol, a drug
that relaxes bronchiolar smooth muscles. Albuterol acts as a(n)
a. cholinergic receptor antagonist
b. cholinergic receptor antagonist
c. adrenergic receptor antagonist
d. adrenergic receptor agonist
e. inhibitor of kinase phosphorylases
Explanation:
The answer is d. Albuterol is an agonist that acts on β2-adrenergic receptors that are located
mainly on the cell membranes of bronchial tissues and, therefore, do not have many side
effects. If it were an antagonist, then it would cause smooth muscle constriction.
3. A patient suffering from asthma has difficulty breathing and is treated with albuterol and
ipratropium, drugs that relax bronchiolar smooth muscles. Ipratropium acts as a(n)
a. cholinergic receptor antagonist
b. cholinergic receptor antagonist
c. adrenergic receptor antagonist

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