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The hormone released by the anterior pituitary that triggers ovulation and transforms the ruptured follicle into the corpus luteum is

In herbivores, cellulose is primarily broken down by

The diploid first cell of a new organism is a(n)

The concentration of oxygen is decreased at high altitude. Why would this make it harder for a person to get enough oxygen into their blood?

A phagocyte is a cell that

The intake of alcohol, cigarette smoke, and insufficient amounts of vitamins may all cause birth defects in a developing fetus.

Fertilization of a secondary oocyte normally occurs in the

In humans, the muscular tube into which urine from the kidney first drains is the

The major excretory organ of the human urinary system is the

Cushing’s syndrome occurs when the body’s tissues are exposed to high levels of cortisol for too long. Many people develop Cushing’s syndrome because they take steroid glucocorticoids such as prednisone for asthma, rheumatoid arthritis, lupus, and other inflammatory diseases. Other people develop Cushing’s syndrome because their bodies produce too much cortisol.Cortisol is produced by the adrenal glands located near the kidney, yet pituitary tumors cause 70% of Cushing’s syndrome cases. The best explanation for this observation is that the pituitary tumor releases