Specialized structures within a cell that have a characteristic shape and perform specific functions in cellular growth, maintenance and reproduction are called
a) organelles.
b) cytoskeletons.
c) cytoplasm.
d) cytosol.
e) nuclei.
Answer: a
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Answer the following statements true (T) or false (F)
1. In one square inch of skin, there are more oil glands than sweat glands. 2. In one square inch of skin, there are about twice as many pressure sensors as heat sensors. 3. The hypodermis is the layer of the skin found between the epidermis and the dermis. 4. Strong, tough collagen fibers can be found in both the dermis and epidermis of the skin. 5. Hair in certain parts of the body is stimulated to grow by the presence of hormones.
Which of the following is not a function of astrocytes?
a. Hold neurons together in proper spatial relationship. b. Line internal cavities of the brain and spinal cord. c. Induce the formation of the blood-brain barrier. d. Take up excess K+ to help maintain proper brain ECF ion concentration. e. Form neural scar tissue.
Exposure to the bacterium Clostridium tetani causes continuous release of acetylcholine. What effect does this have on smooth muscle?
A. Flaccid paralysis B. Spastic paralysis C. Lockjaw D. No effect E. Myocardial atrophy
Ions with a negative charge are called
A) cations. B) anions. C) radicals. D) positrons. E) isotopes.