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Cyanide works by making the human body unable to use oxygen.
Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).
Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.
Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.
![Mammography. (a) A health-care professional assists the patient to ensure the breast is placed ideal](https://biology-forums.com/gallery/47/medium_14755_16_10_12_12_29_16_94441524.jpeg)
![After excavation, recovered remains are screened to ensure that even tiny fragments are retrieved an](https://biology-forums.com/gallery/47/medium_273688_23_02_15_8_21_29_209011417.jpeg)