The Sun is acting weird. It typically puts on a pageant of magnetic activity every 11 years for aurora watchers and sungazers alike, but this time it overslept. When it finally woke up (a year late), it gave the weakest performance in 100 years.
Each bone in your body is made up of three main types of bone material: compact bone, spongy bone, and bone marrow. Compact bone. Compact bone is the heaviest, hardest type of bone. It needs to be very strong as it supports your body and muscles as you walk, run, and move throughout the day.how/hide words to know. 1  Bone marrow: the tissue in the middle of bones that creates red and white blood cells 2  ... Compact bone: the heaviest, hardest type of bone in the body. 3  Lining cell: flat cells that make up and cover the outer layer of bone. 4  Marrow: a soft tissue found inside bones.
Structure of a Typical Long Bone Long bones have a tubular bone shaft, consisting of a bone collar surrounding a hollow medullary cavity, which is filled with yellow bone marrow in adults. Epiphyses are at the ends of the bone, and consist of internal spongy bone covered by an outer layer of compact bone.ocation of Hematopoietic Tissue in Bones Hematopoietic tissue of bones, red bone marrow, is located within the trabecular cavities of the spongy bone in flat bones, and in the epiphyses of long bones.