Which of the following terms is used to define the structure that separates the contents of a human cell from its surrounding medium?
A) cell wall
B) cell layer
C) plasma membrane
D) cell boundary
E) nuclear envelope
C) plasma membrane
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________ is the study of tissue structures
A) Gross anatomy B) Pathology C) Biology D) Microbiology E) Histology
Which of the following statements indicates the way in which the body's natural defenses protect the skin from the effects of UV damage?
A) The skin is protected by the synthesis of three pigments that contribute to the skin's color. B) The skin is protected by increasing the number of epidermal dendritic cells, which help to activate the immune system. C) Carotene, which accumulates in the stratum corneum and hypodermal adipose tissue, is synthesized in large amounts in the presence of sunlight. D) Prolonged exposure to the sun induces melanin dispersion, which in turn acts as a natural sunscreen.
Damage to the liver would hamper digestion of ________.
A. proteins B. disaccharides C. carbohydrates D. lipids E. All of the choices are correct.
In a neuron, the opening of sodium gates typically leads to ________.
A. depolarization of the plasma membrane B. plasma membrane voltage returning to the resting membrane potential C. drifting of plasma membrane voltage toward a more negative value D. hyperpolarization of the plasma membrane E. repolarization of the plasma membrane