The uterine lining, or endometrium, is the internal layer of the uterus which thickens and gets filled with blood vessels in preparation to receive a fertilized egg. If this does not happen, the uterus removes this extra layer through the vagina, in a process called menstrual flow, which lasts 5 days average.
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3. Ligament
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9. Spongy Bone
10. Skeletal System
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12. Bone Marrow
Stem cell research has and can lead to medical cures.
There are four main types of tissue<span>: muscle, epithelial, connective and nervous. Each is made of specialized cells that are grouped together according to structure and </span>function<span>. Muscle is </span>found<span> throughout the </span>body <span>and even includes organs such as the heart. Our outer layer of skin is epithelial </span><span>tissue.</span>