During the secretory phase, the corpus luteum secretes ____ levels of estrogen and ____ levels of progesterone

a. high, high
b. high, low
c. low, high
d. low, low


A

Anatomy & Physiology

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a. in the stomach b. in the small intestine lumen c. on the brush borders of the small intestine epithelial cells d. in the colon e. in the rectum

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The erythrocyte (red blood cell) count increases after a while when an individual goes from a low to a high altitude because the ________

A) basal metabolic rate is higher at high altitudes B) concentration of oxygen and/or total atmospheric pressure is lower at high altitudes C) concentration of oxygen and/or total atmospheric pressure is higher at higher altitudes D) temperature is lower at higher altitudes

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Toll-like receptors (TLRs) trigger the release of ________ to attract white blood cells to the scene.

A) cytokines B) histamine C) prostaglandins D) complement

Anatomy & Physiology