Oxygenated (arterial) blood is bright red, while dexoygenated (venous) blood is dark reddish-purple. Period blood can vary in color and relays important information about a person’s health. For example, the rate of your menstrual flow can affect period blood color. Period Blood Color – What Does It Mean? Oxygen is low in your vein because the oxygen was delivered to all of your cells. 40 mins later i go to the store and take Plan b. This condition is known as hematospermia. In the case where blood comes from the upper part of the digestive tract (the stomach or small intestine), it will appear dark to almost black and tarry. Now why is your sperm brown? Black or brown vomit is usually a medical emergency so it’s important to know the signs. Hello, blood on the undies—and you’ll probably experience discomfort, as well. Vein blood is darker. Blood in stool may result from bleeding in the upper or lower gastrointestinal (GI) tract — and the color of the blood can help indicate its source.. Black, tarry stool. It has many possible causes, including urethral stricture and a prostate infection. Blood is a dark red color, but various factors can affect if the blood is pink, brown, bright red, or black. Infection ; The most common cause of a dark brown semen is an infection. It wasnt until after he pulled out we realized the condom broke. Hematospermia or the presence of blood in the semen is caused by several factors. Changes in the color of your period blood usually mean that you are having a normal period. The following are the common causes. Its been 6 days since i took the pill and i started experiencing a dark brown discharge or what could be a period. The difference is color results from the electronic state of the iron ion (ferrous vs ferric), which in turn influences the π → π* and n → π* electronic transitions of … Normal period blood typically varies from bright red to dark brown or black. Dark bile means you’re vomiting up blood and is a sign of upper gastrointestinal bleeding. Here's some information on which color is best for different situations. Amanda Becker. This is usually from an infection, ulcers, internal bleeding, or medication like NSAIDs. It can come in a rainbow of shades from pink and whitish to bright red and even dark … Some owners are not aware that dark stool can actually mean the presence of blood. Your arteries need to be surrounded by muscle to pump your blood more efficiently. Blood turns from bright red to dark red when oxygen is low. T. Broderick Date: January 25, 2021 Dark semen is caused by blood mixing in with semen.. Having dark semen is a sign of blood mixing in with the semen. 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