This figure shows the muscles of facial expression. What muscle does number 9 indicate?
A. Mentalis
B. Levator labii superioris
C. Risorius
D. Sternocleidomastoid
E. Depressor labii inferioris
E
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What is the mechanism of marrow cavity enlargement in a long bone?
A) There is no mechanism; once formed, the marrow cavity does not change in size. B) Blood vessels entering the marrow cavity enlarge it by eroding away the inner surface of the bone. C) The bone marrow cavity only increases in length, as the epiphyseal plates move apart. D) As bone matrix is added to the external surface, osteoclasts remove matrix in the center of the bone to enlarge the cavity. E) None of the answers are correct.
Match the cells/tissue with the hormone it secretes.
1. progesterone, early in pregnancy 2. human chorionic gonadotropin 3. estrogen in nonpregnant woman 4. testosterone A. Leydig cells B. granulosa cells C. corpus luteum D. placenta
Protein-bound Ca2+ is the form of calcium that is important in neuromuscular excitability
Indicate whether the statement is true or false
Which of the following are the maintenance cells in bone tissue?
A. Osteocytes B. Osteochondral progenitor cells C. Chondrocytes D. Osteoclasts E. Osteoblasts