What best describes aerobic exercise?
Movement of large muscle groups which increase the body's use of oxygen
Lengthening of muscles using slow, controlled movements
Any activity not related to a person's occupation
A form of exercise in which our muscles work against resistance
The Correct Answer is A
A. Aerobic exercise involves continuous, rhythmic movements of large muscle groups, such as those in the legs and arms, that increase the body’s demand for oxygen. This type of exercise improves cardiovascular and respiratory efficiency, increases endurance, and helps with weight management. Examples include running, swimming, cycling, and brisk walking. During aerobic exercise, the heart rate and breathing rate increase to supply sufficient oxygen to working muscles.
B. Lengthening muscles using slow, controlled movements describes stretching exercises, which improve flexibility but do not primarily enhance cardiovascular endurance or oxygen utilization.
C. Physical activity not related to a person’s occupation is simply recreational or leisure activity. While some recreational activities can be aerobic, this description does not define aerobic exercise itself.
D. Exercise in which muscles work against resistance describes anaerobic or resistance training, such as weightlifting or strength training. While these activities build muscular strength and power, they do not primarily rely on oxygen for energy production.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. The elderly and infants are at the highest risk for dehydration due to physiological factors. Infants have a higher body water content and a faster metabolism, making them more vulnerable to fluid loss during illness, fever, or hot weather. They also rely entirely on caregivers for fluid intake. Elderly adults have a reduced sense of thirst, decreased kidney function, and often take medications that affect fluid balance, which increases their susceptibility to dehydration.
B. While people with diabetes or cardiovascular disease may be at some risk for fluid imbalances, they are not universally at the highest risk for dehydration. Proper management of these conditions can reduce the likelihood of significant dehydration.
C. School-aged children are generally less vulnerable to dehydration than infants because they can communicate thirst and have more mature fluid-regulating mechanisms.
D. Athletes and adolescents can become dehydrated during intense exercise or heat exposure, but with proper hydration practices, the risk is lower compared to the physiologically vulnerable populations of infants and the elderly.
Correct Answer is A
Explanation
A. Bone tissue is composed of osteocytes, which are mature bone cells embedded in a mineralized matrix. Osteocytes help maintain bone structure, regulate mineral content, and communicate with other bone cells to support bone remodeling and repair. Bone tissue provides structural support, protects vital organs, facilitates movement by serving as attachment sites for muscles, and stores minerals such as calcium and phosphorus.
B. Liver tissue is made up of hepatocytes, not osteocytes. The liver functions in metabolism, detoxification, and bile production, rather than providing structural support like bone tissue.
C. Lymph is a fluid tissue composed of lymphocytes and other immune cells, not osteocytes. It plays a role in immune defense and fluid balance, not skeletal support.
D. Blood is a connective tissue composed of erythrocytes, leukocytes, and platelets suspended in plasma. It does not contain osteocytes and functions primarily in transport of oxygen, nutrients, waste, and immune cells.
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