Which structures separate the cranial bones at birth and allow for limited movement of the bones relative to one another?
A. Wormian bones
B. Sesamoid bones
C. Cartilaginous plates
D. Sutures
E. Fontanels
E. Fontanels
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Suppose the pubic symphysis did not exist in the pelvic girdle and the two pubic bones were fused in the middle. Which of the following best describes the way the region would be affected if this joint was removed?
A. The femurs would have a limited range of motion without the high-mobility symphysis joint. B. Childbirth would have a high mortality risk because the pelvic girdle would be rigid and unmoving. C. The femurs would grind inside the acetabulum and cause pain because of a lack of cartilage. D. The pelvic girdle would be highly unstable because the pubic symphysis adds stability and rigidity.
The hypothalamus
A. is inferior to the thalamus. B. forms the anterior wall of the third ventricle. C. communicates with the pituitary gland via the infundibulum. D. All of the above
Which of the following statements concerning types of muscle contractions is false?
A. In isotonic contractions, the amount of tension produced by the muscle fibers is constant during the contraction. B. The contractile processes in isometric and isotonic contractions are the same. C. In isometric contractions, the amount of tension produced by the muscle is constant. D. Most skeletal muscle contractions are a combination of isometric and isotonic contractions. E. In isotonic contractions, the muscle fibers shorten.
How many autosomal chromosomes are present in human cells?
A. 22 pairs B. 2 pairs C. 46 D. 23 pairs