Humans produce sounds by controlling the
vibration of vocal cords as air passes through
the
a. pharynx.
b. glottis.
c. epiglottis.
d. pleura.
e. trachea
B
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Which of the following statements are not true of the relationship of xylem and phloem?
A. Water exiting the phloem may enter the xylem and be transported to leaves. B. The volume of water moving through the phloem is small compared to that in the xylem. C. The number and size of xylem conduits greatly exceeds the number and volume of sieve tubes. D. In phloem, the plant actively generates the force that drives transport, whereas movement in xylem is largely driven by transpiration. E. Phloem cells are dead at maturity, whereas xylem cells are alive at maturity.
In comparing aerobic and anaerobic cellular respiration, how much more effective is aerobic cellular respiration in net energy release?
A. 18 times (36 ATP:2 ATP) B. 20 times (40 ATP:2 ATP) C. 2 times (4 ATP:2 ATP) D. 17 times (34 ATP:2 ATP)
The myelin sheath plays an important role in neuron structure and function. However, when the myelin sheath is missing or not fully intact, there are consequences
There are many conditions that cause demyelination of neurons, some are autoimmune disorders, such as multiple schlerosis, and others are hereditary. The symptoms of these conditions vary, but often include speech impairment and difficulty coordinating movement. Which of the following correctly connects the symptoms of demyelination with the process of nerve impulse transmission? A) Demyelination prevents the formation of an action potential in sensory neurons that transmit signals from the environment to the central nervous system. B) Demyelination slows nerve impulse transmission. C) Demyelination prevents the uptake of neurotransmitters needed to propagate a message to the next neuron. D) Demyelination targets the central nervous system.
Lucy, a new Army recruit, stood in formation for long periods of time without moving an inch. She eventually became lightheaded and fainted because her blood pressure dropped. What might have caused her blood pressure to drop?
What will be an ideal response?