Striated Muscle:
Striated muscles, also known as skeletal muscles, are responsible for voluntary movements. They are attached to the skeleton and help in locomotion and maintaining posture.

Structure:
- Striated muscles are long, cylindrical, and multinucleated.
- They have a striped or striated appearance due to the arrangement of contractile proteins called actin and myosin.
- The actin and myosin filaments are organized into repeating units called sarcomeres, which are responsible for muscle contraction.
- Connective tissue called fascia surrounds and supports the muscle fibers.

Location in the body:
- Striated muscles are found throughout the body, attached to the skeleton.
- They are present in the limbs, trunk, neck, and face.
- Examples include the muscles of the arms, legs, chest, back, and abdomen.

Unstriated Muscle:
Unstriated muscles, also known as smooth muscles, are responsible for involuntary movements. They are found in various organs and vessels of the body.

Structure:
- Unstriated muscles are spindle-shaped and have a single, centrally located nucleus.
- They lack the striped appearance due to the absence of organized sarcomeres.
- The actin and myosin filaments are randomly arranged within the muscle fibers.
- Connective tissue called endomysium surrounds the individual muscle fibers.

Location in the body:
- Unstriated muscles are found in the walls of hollow organs such as the stomach, intestines, bladder, and blood vessels.
- They are also present in the respiratory tract, reproductive organs, and the iris of the eye.
- These muscles control involuntary movements like peristalsis and vasoconstriction.

Cardiac Muscle:
Cardiac muscle forms the walls of the heart and is responsible for pumping blood throughout the body.

Structure:
- Cardiac muscle cells are cylindrical and branched, with a single nucleus.
- They have a striated appearance like skeletal muscle due to the presence of organized sarcomeres.
- Intercalated discs, specialized junctions between cells, allow for coordinated contractions.
- Connective tissue called endomysium surrounds the individual muscle fibers.

Location in the body:
- Cardiac muscle is found exclusively in the heart.
- It forms the walls of the atria and ventricles, allowing for the rhythmic contraction and relaxation required for pumping blood.
- The coordinated contractions of cardiac muscle ensure efficient circulation throughout the body.

Short Notes - The Fundamental Unit of Life:
The fundamental unit of life is the cell, which is the smallest structural and functional unit of living organisms. Cells are classified into two types: prokaryotic and eukaryotic.

Prokaryotic Cells:
- Prokaryotic cells are simpler and lack a true nucleus.
- They are typically smaller in size.
- Examples of prokaryotic cells include bacteria and archaea.
- They have a cell wall, plasma membrane, cytoplasm, and genetic material in the form of circular DNA.

Eukaryotic Cells:
- Eukaryotic cells are more complex and have a true nucleus.
- They are larger in size compared to prokaryotic cells.
- Examples of eukaryotic cells include animal cells