An instructor is reviewing the physiology of the female reproductive system with a group of students. In discussing the uterine anatomy, the instructor emphasizes the role of the myometrium. Which statement accurately reflects a function of the uterine myometrium?
Responsible for uterine contractions
Primary support for the uterus
Thickens in response to estrogen
Covers the exterior portion of the uterus
The Correct Answer is A
A. Responsible for uterine contractions: The myometrium is the thick middle layer of uterine smooth muscle and is the contractile layer responsible for rhythmic uterine contractions (e.g., labor, Braxton–Hicks) .
B. Primary support for the uterus: Structural support of the uterus is provided mainly by pelvic ligaments and pelvic floor muscles; this is not the primary role of the myometrium.
C. Thickens in response to estrogen: The endometrium (the mucosal lining) thickens cyclically in response to estrogen; the myometrium undergoes hypertrophy in pregnancy but is not the layer described by cyclic thickening of the uterine lining.
D. Covers the exterior portion of the uterus: The outer covering of the uterus is the perimetrium (serosa), not the myometrium.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Expiratory reserve volume: Expiratory reserve volume is the additional air that can be forcefully exhaled after a normal exhalation, not the maximum after a maximal inhalation.
B. Inspiratory capacity: Inspiratory capacity is the maximum amount of air that can be inhaled after a normal exhalation (tidal volume + inspiratory reserve), not the total that can be expelled after maximum inspiration.
C. Vital capacity: Vital capacity is the maximum volume of air that can be expelled from the lungs after a maximum inspiration (inspiratory reserve + tidal + expiratory reserve) .
D. Tidal volume: Tidal volume is the volume of a normal, resting breath and is far less than the maximum expelled volume.
Correct Answer is D
Explanation
A. 70–80%:This range is typical for newborns/infants, not average adults.
B. 10–20%:Far too low -corresponds to extreme dehydration or measurement error; not normal.
C. 30–40%:Lower than typical adult values; may be seen in elderly people with high fat mass.
D. 50–60%:Average adult total body water is roughly 50–60% of body weight (higher in lean males, lower in females/older adults).
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