- published: 14 Jan 2015
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The breast is the upper ventral region of the torso of a primate, in left and right sides, which in a female contains the mammary gland that secretes milk used to feed infants.
Both men and women develop breasts from the same embryological tissues. However, at puberty, female sex hormones, mainly estrogen, promote breast development, which does not occur in men, due to the higher amount of testosterone. As a result, women's breasts become far more prominent than those of men.
During pregnancy, the breast is responsive to a complex interplay of hormones that cause tissue development and enlargement in order to produce milk. Three such hormones are estrogen, progesterone and prolactin, which cause glandular tissue in the breast and the uterus to change during the menstrual cycle.
Each breast contains 15–20 lobes. The subcutaneous adipose tissue covering the lobes gives the breast its size and shape. Each lobe is composed of many lobules, at the end of which are sacs where milk is produced in response to hormonal signals.
Ryan Rodney Reynolds (born October 23, 1976) is a Canadian film and television actor. Reynolds is known for playing the role of Michael Bergen on ABC's sitcom Two Guys and a Girl (1998–2001), Wade Wilson / Deadpool in X-Men Origins: Wolverine, and Hal Jordan / Green Lantern in Green Lantern. He has also appeared in films such as National Lampoon's Van Wilder, Just Friends, Definitely, Maybe, The Proposal, The Change-Up, and Safe House.
Reynolds was born in Vancouver, British Columbia. His father, Jim, is a food wholesaler, and his mother, Tammy, is a retail salesperson. He is of Irish ancestry and was raised as a Roman Catholic. The youngest of four brothers, he graduated from Kitsilano Secondary School in Vancouver in 1994. He later attended Kwantlen Polytechnic University, also in Vancouver, until dropping out.
Reynolds' career began in 1990 when he starred as "Billy" in the Canadian-produced teen soap Hillside, distributed in the United States by Nickelodeon as Fifteen. As an adult, Reynolds starred in the National Lampoon movie Van Wilder and the American television series Two Guys, A Girl and a Pizza Place, playing medical student Michael "Berg" Bergen. In 1993-94 he had a recurring role in The Odyssey as Macro. He also cameoed in Harold & Kumar Go to White Castle as a nurse, appeared in The In-Laws with Michael Douglas and Albert Brooks, as well as the Canadian production Foolproof.