In males, the primary source of estrogens is the ________

A) heart B) hypothalamus C) ovaries D) adrenal cortex


Answer: D

Biology & Microbiology

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Rattlesnakes strike and inject venom into prey and then release the prey item and follow it

until the venom takes its effect. Typically, rattlesnakes strike at the base of the skull, and their strike accuracy is very high. Because the brain is very active, it produces a lot of heat, and this is detected by the snakes with __________ located in pit organs on the anterior region of the head.

a. thermoreceptors b. photoreceptors c. chemoreceptors d. pain receptors

Biology & Microbiology

The site on a chromosome where a gene is located is called its ____

a. character b. marker c. locus d. trait e. homologue

Biology & Microbiology

Which of the following steps initiates an inflammatory response?

A) Macrophages engulf the debris or foreign material. B) Macrophages secrete cytokines. C) Arterioles dilate. D) Capillary permeability increases. E) Leukocytes migrate to the infection.

Biology & Microbiology

Which of the following is considered a key human made contributor to global warming?

a. carbon dioxide b. hydrochlorofluorocarbons c. nitrous oxide d. ethane e. surface ozone

Biology & Microbiology