At what developmental stage does the conceptus implant in the uterine wall?
A. Zygote
B. Trophoblast
C. Morula
D. Embryo
E. Blastocyst
Answer: E
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The layer of a vessel wall that contains smooth muscle is the tunica ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following muscles flexes the wrist?
A. Extensor carpi radialis brevis B. Coracobrachialis C. Flexor carpi radialis D. Flexor pollicis brevis E. Anconeus
Oxygen is required in biological systems for
A) cellular respiration. B) storage of energy. C) serving as a structural component of bone. D) serving as a catalyst. E) chemical messengers.
Which of the following events occurs last in intramembranous ossification?
A. Cancellous bone is formed. B. Periosteum is formed. C. Many tiny trabeculae of woven bone develop. D. A membrane of delicate collagen fibers develops. E. Osteoprogenitor cells become osteoblasts.