In the intestine, ________ ensure(s) that most digested nutrients pass through the epithelial cells and not between them.
A. the plasma membrane
B. desmosomes
C. gap (communicating) junctions
D. tight junctions
E. ground substance
Answer: D
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When a membrane is stimulated due to opening of chemically-gated Na+ channels
a. an impulse is propagated. b. a graded potential is established. c. an action potential is inhibited d. the voltage across the membrane becomes more negative. e. the voltage across the membrane stays the same.
What muscle raises the upper eyelid?
A) lacrimal B) orbicularis oculi C) levator palpebrae superioris D) superior rectus muscle
Which of the following produces a lipid-rich secretion that prevents the upper and lower eyelids from sticking together at their edges?
A) palpebra B) lacrimal caruncle C) chalazion D) tarsal gland E) conjunctiva
What are the three components of a typical cell?
A) Nucleic acids, organelles, and nucleus B) Nucleus, plasma membrane, and cell wall C) Nucleic acids, cells wall, and organelles D) Nucleus, plasma membrane, and cytoplasm