A seed storage protein accumulates during seed development and supplies nitrogen and amino acids during germination. Storage globulins such as legumin are examples. Packaging the material into stable assemblies allows the seed to preserve resources before growth resumes. The storage role describes a physiological use rather than one universal sequence family; different plants store different mixtures of proteins. ^[ref]

A call whose result is returned directly, with no further computation waiting in its caller. Its caller's activation record can therefore be replaced rather than retained. A recursive tail call gives tail recursion; an explicit loop updating the current arguments performs the same control transfer without requiring compiler optimization.

Oberon is a programming language designed by Niklaus Wirth, evolving from Modula-2 with a deliberately small collection of constructs. Its modules organize declarations and imports; record type extension relates new record types to existing ones. An extending record retains its base fields and can add more, supporting controlled specialization. The language and the Oberon operating-system project are distinct objects. Different revisions have different rules, so the cited language report matters when discussing exact syntax or type compatibility.^[ref]

A conversion inserted by the language's typing rules rather than an explicit conversion call in source code. Its availability depends on scope and the conversion rules; converting a method receiver and converting an argument are distinct uses. In Scala, an imported implicit conversion can supply a rational-number receiver for an integer expression lacking an applicable multiplication overload.

Urine is the fluid excreted by the urinary system after renal filtration and tubular processing. Its composition reflects regulated retention and removal, not simply the constituents of filtered blood. Water concentration and the excretion rate of a particular solute are different measurements.

The lymphatic system comprises lymph, transporting vessels and associated lymphoid tissues. It returns interstitial fluid to the circulation, transports some absorbed lipids and supports immune surveillance. Unlike the main blood circulation, its collecting pathways begin in tissues rather than forming one continuous closed loop.^[ref]

Mucus is a hydrated secretion rich in large glycoproteins that forms a protective and lubricating surface material. Its viscosity and transport properties influence clearance in airways and protection in the digestive tract. It is a functional material, distinct from the mucous membrane that produces or supports it.

Oxygen saturation is the fraction of oxygen-binding sites occupied on a carrier such as haemoglobin. It differs from dissolved oxygen partial pressure and from total oxygen content. The latter also depends on how much carrier is present, so equal saturations need not imply equal oxygen delivery.

Gas exchange transfers gases between compartments, commonly across a thin biological surface. Diffusion is driven by differences in partial pressure, while ventilation and circulation renew the fluids on either side. A large exchange area is useful only when transport maintains the relevant gradients.

A functional change in an organism following a stimulus. The response can occur remotely through reflexes without transport of the original stimulus to the responding tissue.

Serum urate is the concentration of urate measured in blood serum. Urate is related to purine breakdown and renal handling, so its measured level reflects both production and removal. A concentration is distinct from a whole-body production rate or the presence of deposited crystals.

Nutrition concerns acquisition and use of materials needed for energy supply, growth, maintenance and function. Digestion, absorption and metabolism connect consumed food to cellular resources. An adequate energy supply does not by itself establish an adequate supply of every essential nutrient.

Secretion is controlled delivery of a cellular product into another compartment or onto a surface. It can involve exocytosis, membrane transport or coordinated glandular activity. Production of a molecule, release of it and its subsequent accumulation are distinct steps.

The urinary system forms, transports, stores and eliminates urine. The kidneys perform filtration and regulated transport, the ureters convey urine to the urinary bladder, and the urethra carries it outward. Regulation of body fluids and movement of the resulting urine are different functions.

Thirst is a motivational state promoting fluid intake. Signals related to body-fluid concentration and circulating volume contribute to its regulation through neural and hormonal pathways. The sensation can therefore change without a simple one-to-one relation to the amount of water recently consumed.

A chemoreceptor is a sensory cell or receptor system responding to chemical composition. In respiratory regulation, carbon-dioxide-related chemical signals contribute to feedback controlling ventilation. Blood transport and neural response introduce delays, so a lumped ventilation model may respond to past rather than present carbon-dioxide partial pressure.

Full text: tsapps.nist.gov/publication/get_pdf.cfm?pub_id=900914

A two-page leaflet hosted on the National Weather Service website. The section “How Lightning Hurts Us” distinguishes electrical, thermal and air-blast mechanisms.

Museum inventory 1417, dated 1840, identifies a many-turn fine-wire instrument with Carlo Matteucci's muscle-current research. Its inscription reads “Galvanometro del Matteucci / 1840 / Corrente Muscolare”.