The central chemoreceptors for respiration are located in the ________; they monitor the blood concentration(s) of ________.
A. aortic and carotid arteries; oxygen
B. pons; carbon dioxide and hydrogen ions
C. medulla oblongata; oxygen
D. pons; oxygen
E. medulla oblongata; carbon dioxide and hydrogen ions
Answer: E
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Which of the following statements is true concerning feedback mechanisms used by homeostasis?
a. Negative feedback mechanisms tend to increase the original stimulus b. Negative feedback works to prevent sudden severe changes within the body. c. Blood glucose levels are regulated by positive feedback mechanisms d. Positive feedback mechanisms always result in excessive damage to the host.
Susan slipped on the ice and was unable to be fully mobile for several days. What disruption to homeostasis would you predict she experienced during her immobile period in terms of her muscular system?
A. Susan's metabolic rate was raised and it initiated sweating. B. Susan was more cold than usual because her inactivity prevented her muscles from helping to regulate her body temperature. C. Susan's uninjured muscles overcompensate for the inactive ones by contracting spontaneously.
Asthma is
A) a collapsed lung. B) an acute condition resulting from unusually sensitive, irritated conducting airways. C) an obstructive tumor. D) characterized by fluid buildup in the alveoli. E) caused by Mycobacterium tuberculosis.
Joints that are held together by collagen-rich dense connective tissue are ________ joints.
Fill in the blank(s) with the appropriate word(s).