lymphatic

Lymphatic System

  • Components of the Lymphatic System:

    • Lymphoid organs: lymph nodes, tonsils, spleen, and sinuses.

    • Additional components: lymphatic vessels, capillaries, lungs, and tissues.

  • Lymphatic Vessels:

    • Exist throughout the entire body.

    • Run alongside the veins.

  • Lymph Nodes:

    • Resemble small pea-sized patches throughout the body.

    • Commonly targeted in lymphatic massages to facilitate the release of excess fluids.

  • Functionality of the Lymphatic System:

    • Blood plasma leaks out between the cells during circulation.

    • 15% of this leaked plasma drains into lymphatic capillaries.

  • Composition of Lymph:

    • Primarily consists of water, electrolytes, waste products from metabolizing cells, and a small amount of proteins.

    • Moves through the body aided by skeletal muscle contractions and the contraction of smooth muscle.

  • Clinical Relevance:

    • The lymphatic massage is used to help the body dispose of excess water and electrolytes, especially by feeling for nodes in the neck area.

Respiration

  • Definition of Respiration:

    • Involves the processes of inhalation (inspiration) and exhalation (expiration).

  • Measurement of Respiratory Rate:

    • Counting how many times a person inhales and exhales.

    • One full breath consists of one inhalation and one exhalation.

    • Usual measurement spans either 30 seconds or one full minute.

  • Process of Respiration:

    • Involves the lungs which supply oxygen to the cells and remove carbon dioxide.

    • Ventilation: Consists of both inspiration and expiration.

  • Anatomy of the Respiratory Tract:

    • Upper Respiratory Tract:

    • Nasal cavities, nose, pharynx, and larynx.

    • Lower Respiratory Tract:

    • Trachea, bronchi, bronchioles, and alveoli.

  • Lungs:

    • Composed of spongy tissues called alveoli.

    • Each lung consists of lobes; the right lung has three lobes, while the left lung has two due to anatomical constraints (heart location).

    • Patients with asthma typically have issues with inflamed alveoli and bronchi.

    • Lungs are covered by a two-layered sac called the pleura, preventing friction and damage.

Anatomy of Breathing Process

  • Air Flow Pathway:

    • Air enters through the nose, passes through the pharynx and larynx, and into the trachea.

    • The trachea divides into the left and right bronchus, which further subdivide into bronchioles and alveoli.

  • Diaphragm:

    • A muscle that separates the lung cavity from the abdominal cavity, playing a crucial role in breathing.

Digestive System

  • Function of the Alimentary Canal:

    • Main pathway for food entering the body and being processed.

    • Responsible for physical and chemical digestion, nutrient breakdown, and solid waste removal.

  • Major Parts of the Digestive System:

    • Mouth, pharynx, esophagus, stomach, small intestine, and large intestine.

    • Accessory Organs:

    • Include teeth, tongue, salivary glands, liver, gallbladder, and pancreas.

  • Physical and Chemical Breakdown of Food:

    • Physical Breakdown (Mastication): Chewing food, initiating digestion.

    • Chemical Breakdown: Involves saliva and gastric juices aiding in digesting food.

  • Digestive Layers:

    • Mucosa: Innermost layer containing mucus and digestive enzymes.

    • Submucosa: Middle layer made up of loose connective tissue, containing glands and lymphatic vessels.

    • Muscularis Layer: Outermost layer with two thin layers of smooth muscle.

  • Muscle Movements in Digestion:

    • Relaxation and Contraction: Helps mix food with juices.

    • Peristalsis: Involuntary wave-like contractions that push food along the digestive tract. Very important terminology to remember.

  • Understanding Digestion:

    • Components of Digestion: Physical and chemical processes reduce food size for easier nutrient absorption.

    • The mixed food ball created during digestion is called a bolus, which is then pushed through the gastrointestinal (GI) tract by peristalsis.

  • Key Terms to Remember:

    • Mastication: Technical term for chewing.

    • Peristalsis: Involuntary contraction that moves food through the digestive system.