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The familiar sounds of your heart are made by the heart's valves as they open and close.
The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.
Famous people who died from poisoning or drug overdose include, Adolf Hitler, Socrates, Juan Ponce de Leon, Marilyn Monroe, Judy Garland, and John Belushi.
![Attachment of transmembrane proteins to the cytoskeleton and extracellular matrix of an animal cell.](https://biology-forums.com/gallery/47/medium_33_20_06_11_5_36_40.jpeg)
![A page from Kelileh o Demneh dated 1429, from Herat, a Persian translation of the ancient Indian Pan](https://biology-forums.com/gallery/47/medium_27638_22_04_12_9_17_11.jpeg)