Which of the following effects of aging impacts the oxygen carrying capacity of the cardiovascular system?
A. The liver may metabolize drugs differently as it ages.
B. The rate of movement through the large intestine increases with age.
C. The enamel on the teeth thins and the gingiva recedes allowing for increased tooth decay and loosening of the teeth.
D. Less intrinsic factor is produced resulting in less vitamin B12 absorption leading to possible pernicious anemia.
Answer: D
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Compared to type 1 (slow oxidative) skeletal muscle fibers, how are type 2X (fast-glycolytic) skeletal muscle fibers different?
A. Type 2X fibers fatigue more readily. B. Type 2X fibers have more abundant myoglobin. C. Type 2X fibers are smaller in diameter. D. Type 2X fibers have more abundant mitochondria. E. Type 2X motor units contain fewer fibers per alpha motor neuron.
In males, the primary genitalia are the ________.
A. epididymides B. ureters C. seminal vesicles D. testes
The metacarpophalangeal joints at the base of the fingers are ________ joints.
A. pivot B. hinge C. condylar D. plane (gliding) E. ball-and-socket
What genetic disorder is the inability to produce normal hemoglobin?
A. albinism B. sickle-cell disease C. hemophilia D. Down syndrome E. achondroplasia