Detailed Notes on Human Organ Systems
Human Organ Systems
- Framework, Protection, Support
Functions of the Skeletal System
- Support: Keeps the body upright and prevents collapsing.
- Protection: Shields soft organs such as the brain, heart, and lungs.
- Movement: Allows movement by working together with muscles.
- Factory: Forms red blood cells specifically in the bone's red marrow.
- Storage: Stores and releases calcium to the body.
Skeletal System Components
Major Bones:
- Cranium (skull)
- Mandible (jaw)
- Clavicle (collarbone)
- Scapula (shoulder blade)
- Sternum (breastbone)
- Rib (rib cage)
- Humerus (upper arm)
- Spinal column (backbone)
- Ulna and Radius (forearm)
- Carpals and Metacarpals (hand)
- Phalanges (fingers)
- Pelvic Girdle (pelvis)
- Sacrum and Coccyx (tailbone)
- Femur (thigh bone)
- Patella (kneecap)
- Tibia and Fibula (lower leg)
- Tarsals and Metatarsals (foot)
- Phalanges (toes)
Types of Bones
- Flat Bone: e.g., sternum
- Irregular Bone: e.g., vertebra
- Sutural Bone: found within joints between certain cranial bones
- Long Bone: e.g., femur
- Short Bones: e.g., carpals
- Sesamoid Bone: e.g., patella
Muscular System
- Function: Works with the skeletal system to produce voluntary movement, helps circulate blood, and move food through the digestive system.
- Structures:
- Skeletal Muscle: Connects to bone and enables voluntary movement through contraction.
- Smooth Muscle: Forms organs that squeeze (involuntary movement, e.g., stomach).
- Cardiac Muscle: Makes up the heart with regular beats controlled by a pacemaker.
Integumentary System
- Components:
- Epidermis: Protects dermis from trauma and chemicals.
- Dermis: Contains blood vessels, sensory receptors for touch, pressure, etc.
- Hypodermis: Stores fat.
- Glands: Exocrine glands (sweat, sebaceous) assist in thermoregulation.
Immune System Functions
- Protection: From pathogens such as bacteria, viruses, and fungi.
- Components: Includes adenoids, tonsils, thymus, lymph nodes, spleen, lymphatic vessels.