Which of the following could contribute the most in preventing or prolonging osteoporosis?
A. girls jumping rope before puberty
B. boys running after puberty
C. middle-age women walking before menopause
D. all of the above are of equal importance
A. girls jumping rope before puberty
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Which type of memory is required to perform several different mental activities simultaneously?
A. Short-term memory B. Permanent memory C. Sensory memory D. Long-term memory E. Interactive memory
Which of the following does not occur in a photoreceptor during exposure to light?
a. Membrane hyperpolarization b. Closure of Na+ channels in the outer segment c. Increased neurotransmitter release from the synaptic terminal d. Decrease in cyclic GMP in the outer segment e. Closure of Ca2+ channels in the synaptic terminal
________ is the general term for a chemical released by the endings of neurons into the bloodstream.
Fill in the blank(s) with the appropriate word(s).
Answer the following statements true (T) or false (F)
1. The organelle where aerobic or cellular respiration occurs is the mitochondria. 2. Lysosomes not only digest microbes but also are involved in the process of “cell suicide” called apoptosis. 3. Lysosomes are baglike structures that contain digestive enzymes. 4. Only about half the population have cells with flagella. 5. Chromatin contains both protein and DNA.