As a person's total length of the blood vessels increases, peripheral resistance ________, and the blood pressure ________ accordingly.
A. decreases; increases
B. decreases; decreases
C. increases; decreases
D. increases; increases
Answer: D
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Which of the following best describes the application of standard gene therapy to address a genetic disorder?
During gestation, powerful uterine contractions are suppressed by elevated levels of ________.
A) estrogen. B) prostaglandins. C) oxytocin. D) progesterone. E) All of the answers are correct.
Which describes sperm development in correct order?
A. Spermatid, primary spermatocyte, secondary spermatocyte, spermatogonium B. Sustentacular cell, spermatid, primary spermatocyte, spermatogonium C. Primary spermatocyte, secondary spermatocyte, spermatogonium, spermatid D. Spermatogonium, primary spermatocyte, secondary spermatocyte, spermatid
What explains the dramatic acceleration in lengthwise bone growth at puberty?
A. Increased activity of osteoclasts occurs in response to parathyroid hormone stimulation. B. Increased rate of calcium deposition occurs due to high blood calcium levels. C. Increased physical activity causes lengthwise growth in response to bone stress. D. Increased secretion of sex hormones promotes epiphyseal plate growth. E. Increased absorption of dietary vitamins and minerals strengthens the matrix.