Which of the following enzymes plays a crucial role in the scavenging of free reactive oxygen radicals?
A. alkaline phosphatase
B. cytochrome C oxidase
C. catalase
D. caspase-3
E. adenosine triphosphatase
C
Catalase is a peroxisomal enzyme that inactivates superoxide, one of the three main free oxygen radicals. The other two oxygen radicals are hydrogen peroxide and hydroxyl radical. Other enzymes listed here do not act as scavengers of free oxygen radicals.
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Four factors that decrease the blood pressure are:
A) exercise, depressants, stimulants, and fasting. B) depressants, fasting, shock, and exercise. C) depressants, fasting, shock, and hemorrhage. D) none of the above.
A physician may refer to a scar left after the healing of a wound as a:
A) cicatrix. B) comedo. C) corn. D) cyst.
The cardiovascular system delivers oxygen-rich blood to the lungs and returns oxygen-poor blood to the cells.?
Indicate whether the statement is true or false
What two things should a person do to lose weight effectively and keep it off?