How does the reproductive system contribute to osteoporosis?
A. Calcium ions released from the bones are excreted.
B. Immune cells resist infections and release chemicals that promote tissue repair.
C. Decreased estrogen levels following menopause contribute to the disease.
D. Lack of exposure to sunlight reduces vitamin D production and decreases calcium absorption.
E. Excessive smoking lowers estrogen levels, which increases bone loss.
C
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Each 100 ml of blood leaving the alveolar capillaries carries away roughly ________ ml of oxygen
A) 10 B) 20 C) 30 D) 50 E) 75
Which hormone is absolutely necessary for ovulation to occur?
A) LH B) FSH C) progesterone D) estrogen
The ____________________ lobes of the cerebral cortex are responsible for initial processing of visual input
Fill in the blank(s) with correct word
Which of the following is not a characteristic of a muscle cell?
A. Plasticity B. Contractility C. Excitability D. Conductivity E. Extensibility