Discuss the bone under the following headlines: Composition, type, parts and structure.

Bones are composed of two types of tissue:

1. Compact (cortical) bone: A hard outer layer that is dense, strong, and durable. It makes up around 80 percent of adult bone mass.

2. Cancellous (trabecular or spongy) bone: This consists of a network of trabeculae or rod-like structures. It is lighter, less dense, and more flexible than compact bone.

Also found in bones:

osteoblasts and osteocytes, responsible for creating bone

osteoclasts or bone resorbing cells

osteoid, a mix of collagen and other proteins

inorganic mineral salts within the matrix

nerves and blood vessels

bone marrow

cartilage

membranes, including the endosteum and periosteum

Explanation:

while the heads of the phospholipid structure attract water, the tails are hydrophobic. the model shows how the hydrophilic section folds around the fluid molecules to bring them into the cell so they don’t need to pass through the hydrophobic tails.