Answer the following statements true (T) or false (F)
1. All bones formed by intramembranous ossification are irregular bones.
2. An osteon contains osteocytes, lamellae, and a central canal, and is found in compact bone only.
3. The trabeculae of spongy bone are oriented toward lines of stress.
4. Each consecutive bone lamella has collagen fibers that wrap in alternating directions.
5. Cartilage has a flexible matrix that can accommodate mitosis of chondrocytes.
1. FALSE
2. TRUE
3. TRUE
4. TRUE
5. TRUE
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Which of the following are not present prior to birth?
A) Pulmonary arterial resistance is high. B) Pulmonary vessels are collapsed. C) Rib cage is compressed. D) Alveoli are expanded. E) Lungs and airways contain only a small amount of fluid.
Which of the following nerves is labeled A in the diagram?
a) phrenic nerve b) ulnar nerve c) intercostal nerve d) femoral nerve e) tibial nerve
In humans, the lungs inflate during respiration when the
A. rib muscles contract. B. diaphragm muscle expands. C. rib muscles and diaphragm muscle contract. D. diaphragm relaxes. E. rib muscles and diaphragm relax.
What is the normal value of arterial percent hemoglobin saturation?
A. 100% B. 97% C. 86% D. 90%