Respiratory
This law states that the pressure of a gas is inversely proportional to its volume during ventilation mechanics.
What is Boyle’s Law?
This phase of the cardiac cycle begins immediately after the closure of the semilunar valves and features no change in ventricular volume despite rapidly falling pressure.
What is isovolumetric relaxation?
This lymphatic organ filters lymph directly and contains both cortical lymphoid follicles and medullary sinuses.
What is a lymph node?
This portion of the nephron is primarily responsible for the reabsorption of the majority of filtered sodium, water, and glucose.
What is the proximal convoluted tubule?
This enzyme produced by pancreatic acinar cells is secreted in an inactive form to prevent autodigestion of the pancreas.
What is trypsinogen?
In the lungs, most carbon dioxide is transported in the blood in this chemical form.
What is bicarbonate (HCO₃⁻)?
In erythrocytes, this enzyme catalyzes the reversible reaction converting carbon dioxide and water into carbonic acid.
What is carbonic anhydrase?
This large lymphatic vessel drains lymph from the lower body and left upper quadrant into the venous circulation.
What is the thoracic duct?
This process describes the movement of substances from peritubular capillaries into the tubular lumen.
What is tubular secretion?
This layer of smooth muscle contraction mixes intestinal contents without producing significant forward propulsion.
What is segmentation?
Type II alveolar cells secrete this substance, which reduces surface tension and prevents alveolar collapse during expiration.
What is surfactant?
This electrocardiogram interval represents the time required for depolarization to travel from the sinoatrial node through the atrioventricular node and into the ventricles.
What is the PR interval?
This transport mechanism moves substances across membranes down their concentration gradient but requires integral membrane proteins.
What is facilitated diffusion?
The descending limb of the loop of Henle is highly permeable to this substance but relatively impermeable to solutes.
What is water?
This muscular movement propels food through the esophagus toward the stomach.
What is peristalsis?
Gas exchange in the lungs occurs most efficiently here because of the extremely thin respiratory membrane composed mainly of simple squamous epithelium.
What are the alveoli?
This ion is primarily responsible for the plateau phase (Phase 2) of the ventricular cardiac action potential.
What is calcium (Ca²⁺)?
The sodium-potassium ATPase directly transports these ions in what ratio during each cycle.
What is 3 sodium ions out and 2 potassium ions in?
This hormone increases water reabsorption in the collecting ducts by promoting insertion of aquaporin-2 channels.
What is antidiuretic hormone (ADH/vasopressin)?
This stomach cell secretes hydrochloric acid.
What are parietal cells?
This part of the medulla primarily sets the basic rhythm of breathing in healthy adults.
What is the dorsal respiratory group?
This blood vessel layer contains smooth muscle and is primarily responsible for regulating vessel diameter and peripheral resistance.
What is the tunica media?
These specialized lymphatic capillaries located in the intestinal villi absorb dietary lipids in the form of chylomicrons.
What are lacteals?
Constriction of this arteriole most directly increases glomerular hydrostatic pressure and helps maintain GFR during mild hypotension.
What is the efferent arteriole?
A patient who undergoes terminal ileum resection later develops deficiencies in fat-soluble vitamins because this substance is no longer efficiently reabsorbed.
What are bile salts (bile acids)?