The organ that surrounds the urethra and secretes an antibiotic protein is the
A) seminal gland (seminal vesicle).
B) bulbourethral gland.
C) prostate gland.
D) vestibular gland.
E) Bartholin's gland.
Answer: C
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The chamber of the heart forming the apex is the left atrium.
Answer the following statement true (T) or false (F)
Select the incorrect statement about the plasma membrane
a. cholesterol contributes to its stability. b. membrane proteins are inserted in a lipid bilayer. c. it consists mostly of proteins. d. its lipid bilayer is not a rigid structure. e. membrane carbohydrates are only on its outer surface.
Erythrocytes
a. do not contain a nucleus. b. survive an average of 120 days. c. do not have the ability to use O2 for energy production despite the fact that they transport O2 to all the other tissues of the body. d. do not contain a nucleus and survive an average of 120 days. e. all of these answers.
Depolarization of a cardiac muscle cell occurs as the result of
A. a decrease in the permeability of the cell membrane to sodium. B. the opening of voltage-gated sodium channels and voltage-gated calcium channels. C. the closure of voltage-gated calcium channels. D. the opening of voltage-gated potassium channels. E. the closure of the voltage-gated sodium channels.