Integumentary System
- Skin: The outermost layer of the body, composed of epidermis (outermost layer), dermis (middle layer), and hypodermis (innermost layer).
- Epidermis: Thin, tough layer containing keratinized cells that protect against environmental factors.
- Dermis: Thicker, flexible layer containing blood vessels, nerves, and connective tissue.
- Hypodermis: Insulating layer of adipose tissue.
- Accessory Structures: Hair, nails, glands (sweat, oil, apocrine), and sensory receptors.
Muscular System
- Muscle Cells: Specialized cells capable of contracting to produce movement.
- Skeletal Muscles: Attached to bones and enable voluntary movement.
- Smooth Muscles: Found in internal organs and blood vessels, enabling involuntary movements.
- Cardiac Muscles: Found only in the heart, responsible for pumping blood.
Skeletal System
- Bones: Hard, mineralized tissue that provides structure, support, and protection.
- Joints: Connections between bones that allow movement.
- Cartilage: Flexible connective tissue that covers bone ends and provides cushioning within joints.
- Ligaments: Tough bands of connective tissue that connect bones at joints.
- Tendons: Tough bands of connective tissue that connect muscles to bones.
Additional Details:
Integumentary System:
- Protects against infection, UV radiation, and mechanical damage.
- Regulates body temperature and fluid balance.
- Contains sensory receptors for touch, pressure, temperature, and pain.
Muscular System:
- Enables movement of the body, limbs, and internal organs.
- Maintains posture and stability.
- Generates heat through muscle contractions.
Skeletal System:
- Provides a rigid framework for the body.
- Protects vital organs (e.g., skull for brain, ribs for heart and lungs).
- Stores minerals (e.g., calcium and phosphorus).
- Produces blood cells within bone marrow.