Railway Science (Biology – Skeleton System)

Tendons - are fibrous connective tissues and are made of collagen. Types of Tendons in the human body : Flexor Tendons, Extensor and Ligamentous. Cartilage: Strong, Flexible Connective tissue that protects your joints and bones. Areolar connective tissue is found between the skin and muscles, around blood vessels and nerves and in the bone marrow. Ligament: Fibrous connective tissue that connects bone to bone.

Type of muscle: Striated muscle fibers (voluntary or skeletal muscles) - These muscles are elongated, unbranched and multinucleated. Moreover, these muscles are attached to the bones and assist in body movements. Smooth muscles (involuntary or unstriated muscles) - These muscles are present as a fusiform elongated sheet.
A single nucleus is present in these muscles and myofibrils (contractile threads) are present longitudinally in these cells. Cardiac muscles are extensively branched. Light and dark bands along with a single nucleus can be observed in the cells of these muscles.

Connective tissue is one of the four primary types of animal tissue, along with epithelial tissue, muscle tissue, and nervous tissue. Vascular bundles: These are complex tissues found in plants that contain xylem and phloem, which are responsible for transporting water and nutrients throughout the plant.

Ligaments - A band of tissue that helps hold bones, joints and organs in place. Areolar connective tissue is the type of tissue which connects and surrounds different organs in the human body.
Tendon is a cord of strong, flexible tissue, similar to a rope. It connects muscles to the bones. Cartilage is a strong, flexible connective tissue that protects the joints and bones.

The 3 types of muscle tissue are cardiac, smooth, and skeletal. Cardiac muscle cells are located in the walls of the heart, appear striped (striated), and are under involuntary control.
Smooth muscle fibers are located in walls of hollow visceral organs (liver, pancreas, and intestines), except the heart, appear spindle-shaped, and are also under involuntary control. Skeletal muscle fibers occur in muscles which are attached to the skeleton.