What causes much of the blood in the fetal right atrium to be shunted to the left atrium through the foramen ovale?
A. The blood pressure in the right atrium is greater than in the left atrium.
B. There is a valve that directs the blood that way.
C. The fetus is in an antigravity situation provided by the amnionic fluid.
D. The blood pressure in the left atrium is greater than in the right atrium.
E. The umbilical arteries have valves.
A
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Only autosomal trisomies involving chromosomes 13, 18, and 21 are survivable. Why is this?
A. These are relatively short chromosomes. B. These are relatively long chromosomes. C. These are relatively gene-poor chromosomes. D. These are redundant chromosomes. E. These chromosomes have no genes.
Which of the following hormones is important in the regulation of sodium ion concentrations in the extracellular fluid?
A) erythropoietin B) antidiuretic hormone C) renin D) aldosterone
The loudness of sound is determined by the vibrations of the __________.
What will be an ideal response?
What is the function of the hypothalamo-hypophyseal tract?
A. Transports nerve impulse from the hypothalamus to the anterior pituitary B. Transports releasing hormones from the hypothalamus to the anterior pituitary C. Transports hormones and nerve impulses from the hypothalamus to the posterior pituitary D. All of the choices are correct.