Bone tissue is made up mostly of calcium and collagen, which is a protein. The outer layer of bone is hard and dense and called compact or cortical bone. The inner layer is called trabecular or cancellous bone. It is lighter than the compact bone and porous.Know More
Compact bone gives the bone its toughness and makes up the great majority of adult bone tissue. Its collagen helps the bone remain somewhat elastic and resist easy fracturing.
Bone is also made up of osteoblasts, which create and mineralize bone, and osteoclasts, which absorb and digest damaged or old bone cells. Osteoclasts have a different origin than osteoblasts as they come from the same stem cells that create white blood cells. Osteocytes are largely osteoblasts that are no longer active but reside in the bone matrix. Bone also contains osteoid, which is a mix of collagen and other protein and mineral salts made of calcium and phosphate.
Tiny columnar cells called osteons make up compact bone. Osteons in turn are made up of osteoblasts and osteocytes. These are arranged around Haverisan canals.
Bone marrow can be found in the trabecular bone, which is separated from the compact bone by a layer called the endosteum. It is here that the solid components of the blood are created.Learn more about Biology
The photosynthetic tissue of a leaf is the palisade parenchyma, the upper layer of the middle layer of the leaf. It sits above the spongy parenchyma, the lower part of the mesophyll with far fewer chloroplasts. The mesophyll is sandwiched between the upper and lower dermis of the plant.Full Answer >
Scientists categorize blood as a connective tissue for two primary reasons. According to Rutgers University, blood originates in embryo in the mesoderm, one of the three primary layers of cells; blood shares this origin with other kinds of connective tissue. And, like other kinds of connective tissue, blood plays a connective role with respect to the systems within the human body.Full Answer >
According to Health Guide Info, an advantage to tissue engineering is that it may help conquer illnesses such as mild and extreme arthritis. A disadvantage is that it can run the risk of harboring latent or hidden diseases in the tissue matter.Full Answer >
Tissue and organ systems are different hierarchical levels of biological organization. Dr. Ingrid Lobo explains for Nature Education that biological organisms are systems of complexity. The basic functional unit of life is a single cell, and cells similar in function assemble to form tissue. An organ is a collection of different tissues joined as a functional unit; a group of organs working together to perform a specific task is an organ system.Full Answer >