The opening connecting the uterus to the cervical canal is the
A) uterine lumen.
B) internal os.
C) ampulla.
D) isthmus.
E) external os.
Answer: B
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When childbirth labor starts, the presence of the hormone oxytocin causes the contractions to increase in strength, which causes the level of oxytocin to increase, which in turn causes the contractions to further strengthen. This would be an example of a
________ feedback mechanism. A) positive B) neutral C) negative
Which of the following labeled structures in the diagram is a site of red blood cell production in adult bones?
a) A b) B c) E d) F e) G
A high count of which of the white blood cells shown in the figure may indicate cancer or hypothyroidism?
a) A b) B c) C d) D e) E
Which of the following is not an anterior relation of the abdominal aorta?
A) pancreas B) horizontal part of duodenum C) left kidney D) coils of jejunum and ileum E) root of the mesentery