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Spongy bone, also called cancellous or trabecular bone, provides structural support and facilitates movement of the joints and limbs. Spongy bone is light and porous and found in most parts of the body and in other bones that do not typically endure large volumes of mechanical stress.


Spongy bone lacks the functional tube-like units called osteon found in compact bone. Osteon are formed by a network of small canals along with osteocyte cells lined up in rings around the canals. They are responsible for providing a channel for blood vessels, veins and nerves.


According to Arizona State University (ASU), "spongy" bone is not dense because it contains holes or "pores." These open areas contain blood marrow, nerves, and blood vessels that transport cells and nutrients. Although the appearance of these bones resembles a sponge, they are actually very hard.


The main function of the spongy layer inside the leaf is the diffusion of carbon dioxide gas through the air spaces found in this region. The spongy layer is part of the mesophyll and consists of irregular-shaped cells and air spaces. Inside the leaf, the mesophyll is the central part that is compos


The main differences between compact bone and spongy bone are their structures and the way each functions. Both types of bone tissues are necessary for movement of the body and support of the skeletal system.


The spongy layer of a leaf features small air spaces between cells that allow for the exchange of gases in photosynthesis. Together with the palisade, the spongy layer makes up the mesophyll of the leaf.


Trabeculae refers to the network of spiny bone processes that make up the framework of spongy bone. Red or yellow marrow is located in the spaces between each trabecula. The type of marrow depends on the person's age and in which bone it is located.


Bones consist of two types of tissue: compact bone and spongy, or cancellous, bone. According to class notes from St. Petersburg College, compact bone is the dense, smooth tissue on the outside of the bone. Spongy bone is porous tissue found on the inside of the bone.


Long bones are found in the upper and lower extremities and provide the body with support, mobility and strength. They also produce red and yellow bone marrow, which is essential to the production of blood cells.


The cells in the spongy layer of plant cells are packed loosely together because it allows for gas exchange. The air spaces between the spongy cells allow the cell to easily facilitate the exchange of carbon dioxide and oxygen between the outside and the inside of the cell.