When the toads are threatened, their glands secrete a milky-white fluid known as bufotoxin.

When lying down, the cerebrospinal fluid as estimated by lumbar puncture is similar to the intracranial pressure.

When renin levels are elevated, the concentrations of angiotensin II and aldosterone increase, leading to increased sodium chloride reabsorption, expansion of the extracellular fluid compartment, and an increase in blood pressure.

When a fluid is flowing through a closed channel such as a pipe or between two flat plates, either of two types of flow may occur depending on the velocity of the fluid: laminar flow or turbulent flow.

When measuring liquid pressure, a loop filled with gas or a light fluid can isolate the liquids to prevent them from mixing but this can be unnecessary, for example when mercury is used as the manometer fluid to measure differential pressure of a fluid such as water.

When fluid flows are not in equilibrium, local pressures may be higher or lower than the average pressure in a medium.

When meconium staining of the amniotic fluid is present and the baby is born depressed, it is recommended by the guidelines that an individual trained in neonatal intubation use a laryngoscope and endotracheal tube to suction meconium from below the vocal cords.

When diluted in amniotic fluid, it may appear in various shades of green, brown, or yellow.

When fluid dissects into the surrounding white matter forming a cystic cavity or syrinx, the term syringomyelia is applied.

When Cole gives it to Kyra's father, the videotape shows Kyra's stepmother putting floor cleaner fluid in Kyra's food while she cared for Kyra during her illness.

When a designer, engineer, or user decides to use a valve for an application, he / she should ensure the rated maximum temperature and pressure are never exceeded and that the wetted materials are compatible with the fluid the valve interior is exposed to.

When this is not available ( e. g. because a court order may be needed and not obtainable ) other methods may need to be used to collect a sample of blood, saliva, semen, or other appropriate fluid or tissue from personal items ( e. g. toothbrush, razor, etc.

When the working fluid is a gas that is compressed and expanded but doesn't change phase, the refrigeration cycle is called a gas cycle.

When the bolus enters the mouth, the fluid is squeezed out with the tongue and reswallowed.

When a voltage is applied, the piezoelectric material changes shape, which generates a pressure pulse in the fluid forcing a droplet of ink from the nozzle.

When the Rayleigh number is below the critical value for that fluid, heat transfer is primarily in the form of conduction ; when it exceeds the critical value, heat transfer is primarily in the form of convection.

When the brakes are applied, brake fluid is forced under pressure from the master cylinder into the wheel cylinder, which in turn pushes the brake shoes into contact with the machined surface on the inside of the drum.

When one spins and stops suddenly, fluid in the inner ear continues to rotate causing a sense of continued spinning while one's visual system no longer detects motion.

When " playing possum ", the animal's lips are drawn back, the teeth are bared, saliva foams around the mouth, the eyes close or half-close, and a foul-smelling fluid is secreted from the anal glands.

When an object ( or disturbance ) moves faster than the information about it can be propagated into the surrounding fluid, fluid near the disturbance cannot react or " get out of the way " before the disturbance arrives.

When the Court was a part of the curia regis, the Officers were fluid ; they could include Doctors of Civil Law, members of the curia and " those who ought to be summoned ".

When " tripped ", it locks up solidly ( typically in a few to tens of milliseconds ) and rotates the driven member just one full turn.

When the trajectory r ( t ) rotates an amount dθ, u < sub > ρ </ sub >, which points in the same direction as r ( t ), also rotates by dθ.

When protecting the body, the boxer rotates the hips and lets incoming punches " roll " off the guard.

When descending a tree headfirst, the red panda rotates its ankle to control its descent, one of the few climbing species to do so.

When a body rotates while subject to tidal forces, internal friction results in the gradual dissipation of its rotational kinetic energy as heat.

When an electric current is applied, the galvanometer's indicator rotates and compresses a small spring.

When an object rotates about its axis, the motion cannot simply be analyzed as a particle, since in circular motion it undergoes a changing velocity and acceleration at any time ( t ).

When reading, the magnetized material rotates past the heads, the ferrite core concentrates the field, and a current is generated in the coil.

When the shutter release is pressed, a light-blocking shield lifts and the shutter disc rotates a full turn exposing the film through its open sector ; when the pressure is released the light-blocking shield returns to its position behind the lens, and the spring motor advances the film and recocks the shutter.

When the solenoid is activated, the core is drawn into the coil, and the disk rotates on the ball bearings in the grooves as it moves towards the coil body.

When power is removed, a spring on the disk rotates it back to its starting position, also pulling the core out of the coil.

When a disc is selected to be played, the carousel rotates so that the disc can be picked up by a pickup mechanism and placed in CD playback unit.

When it is turned on, it rotates and blows the soot off the tubes and out through the stack.

When an archerfish selects its prey, it rotates its eye so that the image of the prey falls on a particular portion of the eye in the ventral temporal periphery of the retina and its lips just break the surface, squirting a jet of water at its victim.

When reading data from a conventional electromechanical hard disk drive, the disk controller must first position the head, relatively slowly, to the track where a given fragment resides, and then wait while the disk platter rotates until the fragment reaches the head.

When the wheel rotates and stops with its arms in the vertical position it is possible for boats to enter and exit the lower caisson when the gates are open without flooding the docking-pit.

When acting alone it rotates to the opposite side ( contralaterally ) and slightly ( laterally ) flexes to the same side.

When the head rotates about any axis ( horizontal, vertical, or torsional ) distant visual images are stabilized by rotating the eyes about the same axis, but in the opposite direction.

When a patient is positioned for a radiographic image attempting to demonstrate Coxa Vara it is important that the technician insures that the patient medially rotates the foot 15 ° on the ipsilateral side ( same side ) being depicted in the film.

When a molecule rotates, the centrifugal force pulls the atoms apart.

When the disk rotates through one complete revolution about a vertical axis, the wire unavoidably acquires a full twist.

When the board rotates more than 90 degrees and then returns to its original position over the course of the slide it is called a pendulum.

When the center of mass is placed in geostationary orbit then the cable rotates once per day with the Earth, and is usually referred to as a space elevator.