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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
Did you know?
It is important to read food labels and choose foods with low cholesterol and saturated trans fat. You should limit saturated fat to no higher than 6% of daily calories.
Did you know?
Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.
Did you know?
Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
![Changes in boreal forest composition along a chronosequence in Quebec. Dates refer to the year of th](https://biology-forums.com/gallery/47/medium_33_17_02_12_6_53_46_2015311.jpeg)
![Lymphatic vessels pick up excess tissue fluid, purify it in the lymph nodes, and then return it to t](https://biology-forums.com/gallery/47/medium_14755_01_10_12_7_59_21_92301561.jpeg)