A population age structure diagram depicting an equal number of individuals in each age group suggests that the population is
A. stable.
B. growing.
C. declining.
D. facing extinction.
E. very small.
Answer: A. stable.
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To restart a heart, rescuers use
a. CPR. b. a defibrillator. c. CPR and a defibrillator. d. serotonin injections. e. all of these.
As in development of normal tissue such as skin, a tumor may contain cancer ________ cells that generate large numbers of descendants
Fill in the blank with correct word.
Which statement best describes the basis of sensory adaptation?
A) A continuously stimulated sensory receptor triggers fewer action potentials, so stimuli sent to the brain decrease and awareness of the stimuli is diminished. B) The nerve fiber synapsed with a sensory receptor gradually returns to its baseline level of firing despite continued neurotransmitter stimulation. C) The spinal cord interneurons that receive a prolonged stimulus gradually come to ignore it. D) The thalamic centers that receive a prolonged stimulus gradually come to ignore it.
In former times, surgeons used small doses of curare to relax the patient's abdominal and other muscles during operations. Why did this compound work? What additional precautions do you think the medical staff needs to put into place when a patient is
under anesthesia? What will be an ideal response?