What sends information to the respiratory centers in the medulla oblongata concerning pH, CO2, and O2?
A. The pontine respiratory group in the pons
B. The peripheral chemoreceptors in the aortic arch and carotid arteries and central chemoreceptors in the medulla oblongata
C. None of these are correct.
D. Both of these answers are correct.
Answer: B
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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.
Parasympathetic effects are localized and short-lived because
A) muscarinic receptors are deactivated by norepinephrine. B) acetylcholine is inactivated at the synapse by acetylcholinesterase. C) norepinephrine hyperpolarizes the postganglionic membrane. D) norepinephrine is inactivated at the synapse by monoamine oxidase. E) epinephrine blocks the muscarinic receptors.
Which of the following statements is true regarding parasympathetic tone?
A) It might increase or decrease heart rate depending on the situation. B) It accelerates the resting heart rate above its intrinsic rate. C) It holds the resting heart rate below its intrinsic rate. D) It affects heart rate only after myocardial infarction. E) It does not affect heart rate.
Which tumor originates in epithelial tissue?
A. Lymphoma B. Sarcoma C. Carcinoma D. Leukemia