What is the structural unit of compact bone?
A) osseous matrix
B) spongy bone
C) lamellar bone
D) the osteon
D) the osteon
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The parasympathetic tone ________
A) causes blood pressure to rise B) prevents unnecessary heart deceleration C) accelerates activity of the digestive tract D) determines normal activity of the urinary tract
Answer the following statements true (T) or false (F)
1) The ethmoid bone is a light spongy bone that forms much of the inner structure of the nose and attaches to the falx cerebri. 2) The temporal bone contains the foramen magnum and forms part of the wall of the jugular foramen. 3) The structures that supports the head on the vertebral column are the occipital condyles. 4) The opening that permits sounds to reach the middle ear cavity is called the internal acoustic meatus. 5) The sacrum is actually the result of five fused sacral vertebrae.
The microscopic modifications on the lumen surfaces of epithelial cells in the small intestine are known as ____.
a) villi b) rugae c) plica circularis d) microvilli
Human chorionic gonadotropin is secreted from cells of the
A. syncytiotrophoblast. B. zygote. C. embryoblast. D. morula.