Human Arterial and Lymphatic System Functions Explained

Major Arteries of the Human Body

• Aorta: Extends from the left ventricle of the heart down to the abdomen.
• Carotid Artery: Located on the left and right sides of the neck.
• Subclavian Artery: Positioned underneath the clavicle.
• Pulmonary Artery: Located at the base of the heart's right ventricle.
• Coronary Artery: Supplies the heart muscle.
• Axillary Artery: Located in the armpit region.
• Brachial Artery: Located in the forearm.
• Posterior Tibial Artery: Located behind the tibia.

The Lymphatic System

The lymphatic system is responsible for the removal of interstitial fluid from tissues, the absorption and transport of fatty acids and fats (as chyle) from the digestive system, and the transport of white blood cells to and from lymph nodes and bones.

Lymphatic System Organs and Locations

• Lymph Nodes: Protect the body by removing foreign materials such as bacteria and tumor cells. Located in the neck, armpits, and groin areas.
• Lymphocytes and Macrophages: Lymphocytes destroy specific invaders, while macrophages destroy non-specific invaders. Found in bone marrow.
• Spleen: Filters blood of bacteria and viruses, destroys old red blood cells, and stores blood. Located below the ribcage, superior to the stomach.
• Thymus: Produces T-lymphocytes. Located anteriorly, superior to the mediastinum.
• Tonsils: Trap and remove debris and foreign substances in the pharynx.

Lymph Vessel Circulation

Lymph vessels that carry lymph to a lymph node are called afferent lymph vessels. Those that carry lymph from a lymph node are called efferent lymph vessels, from where the fluid may travel to another lymph node, return to a vein, or travel to a larger lymph duct.

Understanding Edema (Swelling)

Edema is a condition characterized by an excess of watery fluid collecting in the cavities or tissues of the body. Six factors contribute to its formation:

1. Increased hydrostatic pressure.
2. Reduced colloidal or oncotic pressure within blood vessels.
3. Increased tissue colloidal or oncotic pressure.
4. Increased blood vessel wall permeability (e.g., inflammation).
5. Obstruction of fluid clearance in the lymphatic system.
6. Changes in the water-retaining properties of the tissues.

Immune System Integration

The lymphatic system supports the immune system by carrying lymph fluid and presenting antigens to the various cells of the immune system.