Digestive Anatomy
The rhythmic, wave-like smooth muscle contractions that move a bolus down the esophagus and through the tract.
Peristalsis
The terminal, grape-like microscopic air sacs where oxygen and carbon dioxide move via passive diffusion.
alveoli
The structural and functional microscopic unit of the kidney responsible for filtering blood and generating urine.
nephron
Thick, band-like connective tissues that physically anchor skeletal muscle complexes securely to bones.
tendons
This painful digestive condition occurs when the protective mucus lining of the stomach wall erodes, allowing hydrochloric acid to burn the underlying tissue.
peptic (gastric) ulcer
This muscular ring controls the structural exit of chyme from the stomach into the duodenum.
Pyloric sphincter
This dome-shaped muscle contracts and flattens downward to create a negative pressure vacuum during inhalation.
diaphragm
The localized, high-pressure capillary bed where non-selective physical filtration forces blood fluid into Bowman's capsule.
glomerulus
The two primary protein myofilaments that slide past one another during an active muscle contraction.
actin and myosin
A chronic respiratory disease characterized by the sudden, involuntary constriction of the bronchioles and excessive mucus production, typically triggered by allergens or exercise.
asthma
These finger-like macroscopic folds and microscopic extensions line the small intestine to optimize nutrient absorption.
villi and microvilli
A flexible flap of cartilaginous tissue that seals off the glottis during swallowing to prevent food entry into the trachea.
epiglottis
Dehydration triggers the release of this pituitary chemical, forcing the collecting ducts to become highly permeable to water.
ADH
Defined as the functional contractile region of a muscle fiber, spanning the precise structural distance from one Z-line to the next.
sarcomere
These painful structures form when excess mineral salts, such as calcium oxalate, precipitate and crystallize out of urine inside the renal pelvis.
The large accessory organ responsible for structurally producing bile used for mechanical fat emulsification.
Liver
The flexible, fluid-filled double membrane that encases the lungs to prevent friction against the thoracic cavity wall.
pleural membrane
The cellular process occurring in the proximal convoluted tubule where molecules like glucose are actively pumped back into the bloodstream.
selective reabsorption
The accepted physiological model describing how muscle fibers shorten as myofilaments pull along one another without changing their individual lengths.
sliding filament theory
A collection of hereditary disorders characterized by the progressive degeneration of skeletal muscle fibers, often caused by a missing structural protein needed to keep muscle cell membranes intact.
Small lymphatic capillaries located inside each intestinal villus that directly absorb fats and fat-soluble vitamins.
Lacteals
The specific region of the brainstem that actively monitors blood carbon dioxide levels and drops in pH to regulate automatic breathing rates.
medulla oblongata
The long, hairpin-shaped section of the nephron that dips into the renal medulla to establish a steep osmotic concentration gradient.
Loop of Henle
A high-energy metabolic compound stored directly in muscle tissue used to instantly regenerate ATP during the initial seconds of high-intensity work.
creative phosphate
This specific excretory dysfunction occurs when the posterior pituitary fails to produce enough ADH (or the nephron fails to respond to it), resulting in extreme thirst and the output of massive volumes of highly dilute urine.
diabetes insipidus