Which of the following statements correctly describes epithelial tissue?
A. Epithelial tissues allow for communication within the body by using electrical and chemical signals.
B. Epithelial tissues cover and line all body surfaces including organs, vessels, and ducts.
C. Epithelial tissues allow for movement of the body.
D. Epithelial tissues have fibers in a matrix.
Answer: B
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The lymphocytes that fight infections in the connective tissues of the body reach these areas by
A) passing independently in and out of the circulatory vessels. B) movement exclusively through the lymphatic vessels. C) passive diffusion. D) movement caused by the contraction of the body musculature. E) None of the answers are correct.
Which of the following statements is true?
A) Active processes require ATP. B) Passive processes move molecules against a concentration gradient. C) Active processes move molecules along a concentration gradient. D) Passive processes require ATP.
Pointing the toes (or standing on tiptoes) is an example of
A. plantar flexion. B. adduction. C. hyperextension. D. dorsiflexion. E. eversion.
Growth hormone is secreted by ________ cells in the anterior pituitary.
A. mammotropic B. thyrotropic C. corticotropic D. somatotropic E. gonadotropic